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Search references for EMPTY STRING. Phrases containing EMPTY STRING
See searches and references containing EMPTY STRING!EMPTY STRING
Unique string of length zero
language theory, the empty string, also known as the empty word or null string, is the unique string of length zero. Formally, a string is a finite, ordered
Empty_string
Sequence of characters, data type
element of which is the empty string. A string s {\displaystyle s} is said to be a prefix of t {\displaystyle t} if there exists a string u {\displaystyle u}
String_(computer_science)
Operations in formal language theory
article defines some of these basic terms. A string is a finite sequence of characters. The empty string is denoted by ε {\displaystyle \varepsilon }
String_operations
Search tree data structure
common prefix with its parent node, and the root node represents the empty string. While basic trie implementations can be memory-intensive, various optimization
Trie
Formalism to describe programming languages
roman-numeral, or an empty string (i.e. nothing). An opt-apt-num consists of a prefix "Apt" followed by an apartment number, or an empty string (i.e. nothing)
Backus–Naur_form
Computer network protocol
https://url.spec.whatwg.org/#concept-basic-url-parser The plus sign represents string concatenation. The specification only explicitly restricts control frames
WebSocket
HTML element
style; tabindex; title; translate) autoplay = "autoplay" or "" (empty string) or empty Instructs the User-Agent to automatically begin playback of the
HTML_audio
Data having only values "true" or "false"
value of zero (integer or fractional), the null value (None), the empty string, and empty containers (lists, sets, etc.) are considered Boolean false; all
Boolean_data_type
Eleventh letter in the Greek alphabet
In formal language theory and in computer science, lambda denotes the empty string. Lambda is a nonstandard symbol in the International Phonetic Alphabet
Lambda
Mathematical model of computation
which case the acceptor accepts the empty string. The example in figure 4 shows an acceptor that accepts the string "nice". In this acceptor, the only
Finite-state_machine
Sequence of characters that forms a search pattern
as regular expressions: (empty set) ∅ denoting the set ∅. (empty string) ε denoting the set containing only the "empty" string, which has no characters
Regular_expression
Type of finite-state machine in automata theory
^{*}(r,\varepsilon )=\{r\}} where ε {\displaystyle \varepsilon } is the empty string, and δ ∗ ( r , x a ) = ⋃ r ′ ∈ δ ∗ ( r , x ) δ ( r ′ , a ) {\displaystyle
Nondeterministic finite automaton
Nondeterministic_finite_automaton
Computer science metric for string similarity
transformed into empty string by // dropping all characters for i from 1 to m: d[i, 0] := i // target prefixes can be reached from empty source prefix //
Levenshtein_distance
Contiguous part of a sequence of symbols
{\displaystyle t=pus} . In particular, the empty string is a substring of every string. Example: The string u = ana {\displaystyle u={\texttt {ana}}} is
Substring
Geometric theorem
concatenated and converted into a string of this type by repeatedly replacing the "forbidden" substrings with the empty string. For instance: abab−1a−1 concatenated
Banach–Tarski_paradox
Data structure
In computer programming, a null-terminated string is a character string stored as an array containing the characters and terminated with a null character
Null-terminated_string
Concept in mathematics
that set, with string concatenation as the monoid operation and with the unique sequence of zero elements, often called the empty string and denoted by
Free_monoid
Value indicating the relation of a proposition to truth
varies by programming language) expressions like the number zero, the empty string, empty lists, and null are treated as false, and strings with content (like
Truth_value
Topics referred to by the same term
<control-0000> , Null sign (∅), the empty set Null (SQL) (ω), a special marker and keyword NULL in SQL Empty string (λ, Λ, or ε), in formal language theory
Null_symbol
Marker used in SQL databases to indicate a value does not exist
database implementations. In an Oracle RDBMS, for example, NULL and the empty string are considered the same thing and therefore 'Fish ' || NULL || 'Chips'
Null_(SQL)
Function defined on formal languages in computer science
to the empty string ε if R's language contains ε, and otherwise evaluates to ∅. This function can be computed by the following rules: A string u is a
Brzozowski_derivative
Text processing programming language
assigned to s, s will be an empty string by default. Adding zero to a variable is an AWK idiom for coercing it from a string to a numeric value. This results
AWK
Address on the World Wide Web
within a userinfo subcomponent unless the data after the colon is the empty string (indicating no password). A host subcomponent, consisting of either a
URL
Unary operation on string sets
{\displaystyle V^{0}=\{\varepsilon \}} (the set consists only of the empty string), V 1 = V , {\displaystyle V^{1}=V,} and define recursively the set V
Kleene_star
Study of the properties of codes and their fitness
x_{k})=C(x_{1})C(x_{2})\cdots C(x_{k})} . The code word of the empty string is the empty string itself: C ( ϵ ) = ϵ {\displaystyle C(\epsilon )=\epsilon }
Coding_theory
Type of grammar for describing formal languages
each string may either match or not match. In case of a match, there is a unique prefix of the string (which may be the whole string, the empty string, or
Parsing_expression_grammar
String used to identify a name of a web or internet resource
within a userinfo subcomponent unless the data after the colon is the empty string (indicating no password). A host subcomponent, consisting of either a
Uniform_Resource_Identifier
Character used to substitute for any other character/s in a string
(*), which can be interpreted as a number of literal characters or an empty string. It is often used in file searches so the full name need not be typed
Wildcard_character
Fifth letter of the Greek alphabet
science it often represents the empty string, though different writers use a variety of other symbols for the empty string as well; usually the lower-case
Epsilon
Markov chain in which all states can be absorbing
state represents the empty string, the second state the string "H", the third state the string "HT", and the fourth state the string "HTH". Although in
Absorbing_Markov_chain
Type of context-free grammar
grammar for which there exists a string that can have more than one leftmost derivation or parse tree. Every non-empty context-free language admits an
Ambiguous_grammar
Number
it is not the value zero. For text fields this is not blank nor the empty string. The presence of null values leads to three-valued logic. No longer is
0
Lemma that defines a property of regular languages
string is always in L {\displaystyle L} ). (1) means the loop y {\displaystyle y} to be pumped must be of length at least one, that is, not an empty string;
Pumping lemma for regular languages
Pumping_lemma_for_regular_languages
Mathematical binary relation
"pp", "pl", "pe", "ppl", "ppe", "ple", "pple", "l", "le", "e", "" (empty string). Given two sequences X {\displaystyle X} and Y , {\displaystyle Y,}
Subsequence
Email authentication method designed to associate a domain with a message stream
fields are inserted in the header. A non-existing field matches the empty string, so that adding a field with that name will break the signature. The
DomainKeys_Identified_Mail
Base-1 numeral system
times. In the unary system, the number 0 (zero) is represented by the empty string, that is, the absence of a symbol. Numbers 1, 2, 3, 4, 5, 6, ... are
Unary_numeral_system
Shell command for formatting and outputting text; like printf() library function
an empty string for %s or 0 for a numeric specifier. If there are more values than specifiers, then the command restarts processing the format string from
Printf_(Unix)
Finite state machine with two tapes (input, output)
\{\epsilon \})\times (\Gamma \cup \{\epsilon \})\times Q} (where ε is the empty string) is the transition relation. We can view (Q, δ) as a labeled directed
Finite-state_transducer
Notation for tree data structures
Branch | Branch "," BranchSet Branch → Subtree Length Name → empty | string Length → empty | ":" number Whitespace (spaces, tabs, carriage returns, and
Newick_format
Rule system for formal languages
symbol, and α {\displaystyle \alpha } a string of terminals and/or nonterminals ( α {\displaystyle \alpha } can be empty). Regardless of which symbols surround
Context-free_grammar
High-level programming language
number to a string, the number will be cast to a string before performing concatenation, but when subtracting a number from a string, the string is cast to
JavaScript
Type of formal grammar
non-terminal symbols, a ∈ Σ is a terminal symbol, and ε denotes the empty string, i.e. the string of length 0. S is called the start symbol. In a left-regular
Regular_grammar
Configuration file format
the argument supplied for this parameter is NULL, the default is an empty string, "". Under Unix, many different configuration libraries exist to access
INI_file
Jakarta's StringUtils has a function called stripToNull which returns null in place of an empty string. Space normalization is a related string manipulation
Trimming (computer programming)
Trimming_(computer_programming)
Notation for context-free formal grammars
represents a constant value), S is the start symbol, and ε denotes the empty string. Also, neither B nor C may be the start symbol, and the third production
Chomsky_normal_form
have defined behavior. The number "0" is skipped, i.e. it produces the empty string - 103 results in the root for units 3 followed by the root for hundreds
Names_of_large_numbers
Top-down parser that parses input from left to right
} and γ {\displaystyle \gamma } represent any string of both terminals and non-terminals (possibly empty). The prefix length corresponds to the lookahead
LL_parser
Formal way to describe formal languages
construct, and it avoids the use of an explicit symbol for the empty string (such as <empty> or ε). WSN has been used in several international standards
Wirth_syntax_notation
Set of cryptographic hash functions
N is set to the empty string, in which case it is the same as SHAKE. S is a customization bit string. The user selects this string to define a variant
SHA-3
In computing, a condition where an expression does not have a correct value
correct. An undefined value must not be confused with empty string, Boolean "false" or other "empty" (but defined) values. Depending on circumstances, evaluation
Undefined_value
Topics referred to by the same term
'' may refer to: An empty string A quotation mark (") A ditto mark A double acute accent (◌̋) A double grave accent (◌̏) An umlaut diacritic (◌̈) A diaeresis
''
Structure of a formal language
is a nonterminal. In the case that the second string (the "body") consists solely of the empty string—i.e., that it contains no symbols at all—it may
Formal_grammar
Hard-coded search path
the object names in LIST. To specify a main program in the LIST, give empty string. Libraries specified by the environment variable LD_PRELOAD and then
Rpath
Digit of 0 before a number
except for the zero in the ones place, which would be denoted as an empty string otherwise. However, for digits after the decimal point, the leading zeros
Leading_zero
Command-line utility
properly even if the value of $1 is a null string. If the quotation marks are omitted and $1 is the empty string, the test command displays the error message:
Test_(Unix)
Encoding for Unicode domain names
LDH subset of ASCII conventionally used for host names, and require that string comparisons between DNS domain names should be case-insensitive. The Punycode
Punycode
Number with all digits equally frequent
the empty string. (Since one digit is read from the input sequence for each state transition, it is necessary to be able to output the empty string in
Normal_number
Formal language that can be expressed using a regular expression
regular language, A* (Kleene star) is a regular language. Due to this, the empty string language {ε} is also regular. If A and B are regular languages, then
Regular_language
Parsing algorithm for context-free grammars
smaller sequences. Any context-free grammar that does not generate the empty string can be represented in CNF using only production rules of the forms A
CYK_algorithm
Delimited series of characters that represent a string in code
outer quotes are double, making the inner single quotes regular text. An empty string is written as "" or ''. Paired delimiters are two different types of
String_literal
Family of metasyntax notations
from being used in the languages, and requires a special symbol for the empty string. In EBNF, terminals are strictly enclosed within quotation marks (".
Extended_Backus–Naur_form
Method of symbol substitution
{\displaystyle u\to \epsilon ,} where ϵ {\displaystyle \epsilon } is the empty string (sometimes also denoted λ {\displaystyle \lambda } ), is called an erasing
Production_(computer_science)
Notation for expressing numbers
with digits 1, 2, ..., k (k ≥ 1), and zero being represented by an empty string. This establishes a bijection between the set of all such digit-strings
Numeral_system
Programming language
string, or if not, returns an empty string: let extract o = match o with | Some i -> string_of_int i | None -> "";; # extract (Some 42);; - : string =
OCaml
Algebraic structure
concatenation as the binary operation, and the empty string as the identity element. Restricting to non-empty strings gives an example of a semigroup that
Semigroup
Data serialization format
contents are a sequence of bytes (not a textual string) Examples: An empty string is encoded as 0:. The string "bencode" is encoded as 7:bencode. Lists are
Bencode
Software engineering object-oriented API
0; subset NonEmptyString of Str where * ~~ /\S/; # at least one non-space character has NonEmptyString $.name is rw; has NonEmptyString $.surname is rw;
Fluent_interface
Cryptographic hash function
conservative about security while still being fast. Hash values of an empty string: BLAKE-224("") = 7dc5313b1c04512a174bd6503b89607aecbee0903d40a8a569c94eed
BLAKE_(hash_function)
68 65 6c 6c 6f 20 77 6f 72 6c 64 21 2c> i.e. 12:hello world!, And an empty string as: <30 3a 2c> i.e. 0:, The comma makes it slightly simpler for humans
Netstring
Shell command for joining files horizontally
character. If the content of a file runs out, the command will use an empty string for the file. As such, the number of output lines will equal the number
Paste_(Unix)
Language consisting of balanced strings of brackets
S, and the production: S → ε | "[" S "]" S That is, S is either the empty string (ε) or is "[", an element of the Dyck language, the matching "]", and
Dyck_language
Higher-order function that combines several parsers
alternative may consist of a single non-terminal or terminal or the empty string. If a simple parser is available for each of these alternatives, a parser
Parser_combinator
Conversely, every noncontracting grammar that does not generate the empty string can be converted to Kuroda normal form. A straightforward technique attributed
Kuroda_normal_form
Deterministic model of computation
in the historical note below), in which the only halting word is the empty string. This is merely to illustrate a simple 2-tag system that uses a halting
Tag_system
Name server for the DNS root zone
hierarchy is an empty string. All fully qualified domain names (FQDNs) on the Internet can be regarded as ending with this empty string for the root domain
Root_name_server
Replacing subterm in a formula with another term
}})} fits the definition of an abstract rewriting system. Since the empty string is in Σ ∗ {\displaystyle \Sigma ^{*}} , R {\displaystyle R} is a subset
Rewriting
Categories of symbols in formal grammars
one string of symbols that contains at least one nonterminal symbol with another. In the case that the body consists solely of the empty string, it can
Terminal and nonterminal symbols
Terminal_and_nonterminal_symbols
Network protocol
the value are null-terminated strings (C strings). The value can be an empty string, in which case the terminating null still remains. Neither name nor value
Simple Common Gateway Interface
Simple_Common_Gateway_Interface
Set of rules defining correctly structured programs
returns the string "boolean" for these primitive types. When used in a logical context, 0, -0, null, NaN, undefined, and the empty string ("") evaluate
JavaScript_syntax
a terminal string from a start predicate, RCGs aim to reduce a start predicate (which predicates of a terminal string) to the empty string, which constitutes
Range_concatenation_grammar
Numeral system in which every non-negative integer can be represented in exactly one way
the empty string. The integer represented by the nonempty digit-string anan−1 ... a1a0 is an kn + an−1 kn−1 + ... + a1 k1 + a0 k0. The digit-string representing
Bijective_numeration
Symbols for constants, special functions
^{\omega },\omega ^{\omega ^{\omega }},\dots } in computer science, the empty string the Levi-Civita symbol in electromagnetics, dielectric permittivity emissivity
Greek letters used in mathematics, science, and engineering
Greek_letters_used_in_mathematics,_science,_and_engineering
Recreational computer programming competition
previous by bitmask, then concatenate ∨ ## if previous is falsey (empty string), push implicit n , ## print Some code golf questions, such as those
Code_golf
Computer science metric of string similarity
x produces uxv. This can also be denoted ε→x, using ε to denote the empty string. Deletion of a single symbol changes uxv to uv (x→ε). Substitution of
Edit_distance
Special character in text processing
considered insignificant. In general, a string filled with spaces can be interpreted as an empty string or a string of missing data. Replacing ordinary spaces
Non-breaking_space
Relational database programming language
value, and is distinct from a value of 0 for an integer column or an empty string for a text column. The concept of Nulls enforces the 3-valued-logic in
SQL
Set of cryptographic hash functions
multiple of eight while supporting both variants. Hash values of an empty string (i.e., a zero-length input text). SHA224("") 0x d14a028c2a3a2bc94761
SHA-2
Object with no referenced value or with defined neutral ("null") behavior
Linq; static class StringExtensions { public static int SafeGetLength(this string valueOrNull) { return (valueOrNull ?? String.Empty).Length; } } public
Null_object_pattern
2003 studio album by Smile Empty Soul
Smile Empty Soul is the debut studio album by American rock band Smile Empty Soul. The album was released on May 27, 2003 via Lava Records. Three singles
Smile_Empty_Soul_(album)
Complexity measure in computer science
to index j (if j < i , S ( i , j ) {\displaystyle j<i,S(i,j)} is the empty string). The length n of S is denoted l ( S ) {\displaystyle l(S)} , and a sequence
Lempel–Ziv_complexity
Type of formal grammar
{\displaystyle S\to \varepsilon } where ε {\displaystyle \varepsilon } is the empty string, or of the form αAβ → αγβ with A ∈ N, α , β ∈ ( N ∪ Σ ∖ { S } ) ∗ {\displaystyle
Context-sensitive_grammar
1966 studio album by the Incredible String Band
Music Starts to Play", "How Happy I Am", "Empty Pocket Blues" & "Everything"s Fine Right Now" "INCREDIBLE STRING BAND (full Official Chart History)". Official
The Incredible String Band (album)
The_Incredible_String_Band_(album)
Type of automaton
{\displaystyle \Gamma } and ε {\displaystyle \varepsilon } denotes the empty string. A PDA is formally defined as a 7-tuple: M = ( Q , Σ , Γ , δ , q 0 ,
Pushdown_automaton
ab, ac, ..., zz, aaa, aab, aac, ..., zzz, ...], where ε denotes the empty string. The strings in this ordering over a fixed finite alphabet can be placed
Shortlex_order
Mathematical set containing no elements
In mathematics, the empty set or void set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero. Some axiomatic
Empty_set
Abstract machine in computer science
the empty string ε {\displaystyle \varepsilon } ) of elements of Γ {\displaystyle \Gamma } ", ε {\displaystyle \varepsilon } denotes the empty string, and
Deterministic pushdown automaton
Deterministic_pushdown_automaton
Platform-agnostic component and application architecture
passed as a string to WinRT by C++ is converted to an empty string In .Net, null being passed as a string to WinRT is converted to an empty string In JavaScript
Windows_Runtime
Data structure
edge. (The lookup algorithm described above will not work when using empty-string edges.) Insert 'water' at the root Insert 'slower' while keeping 'slow'
Radix_tree
Specific element of an algebraic structure
Subsets of a set M ∩ (intersection) M ∪ (union) ∅ (empty set) Strings, lists Concatenation Empty string, empty list A Boolean algebra ∧ {\textstyle \land }
Identity_element
Structure on sequences of digits 1 and 2
conditions: f (0) = f (1) = 1 (there is one rank-0 string, the empty string, and one rank-1 string, consisting of the single digit 1). These initial conditions
Young–Fibonacci_lattice
EMPTY STRING
EMPTY STRING
Surname or Lastname
English
English : of uncertain origin. It is argued by Redmonds that this surname may have developed as a variant of Stringfellow, through a process, attested in various parish records, in which the original name is first shortened and then expanded into a form different from the original; thus Stringfellow becomes Stringfell, which becomes reinterpreted as Stringfield.
Girl/Female
Biblical
Den, making empty, watching.
Surname or Lastname
English
English : occupational name for a maker of string or bow strings, from an agent derivative of Middle English streng ‘string’. In Yorkshire, where it is still particularly common, Redmonds argues that the surname may have been connected with iron working, a stringer having operated some form of specialist hearth.
Boy/Male
Arabic
Empty.
Boy/Male
British, English, Spanish
Strong Leader; Empty
Biblical
who is empty, exhausted;free, empty, exhausted;
Biblical
den; cave; making empty
Biblical
den; making empty; watching
Boy/Male
Biblical
Who is empty or exhausted.
Boy/Male
American, Australian, Danish, French, Jamaican, Latin
Vain; Empty; Poor; Robbed; Hollow
Boy/Male
Hindu
One who is empty, Hollow, Vain
Surname or Lastname
English
English : metonymic occupational name for a maker of strings or bow strings, from Middle English streng ‘string’, ‘cord’.
Girl/Female
Biblical
Empty, temple of the head.
Surname or Lastname
English
English : nickname for a foolish or eccentric person, from a diminutive of Foll, from Old French fol ‘mad’, ‘stupid’ (Late Latin follis, originally a noun denoting any of various objects filled with air, but later transferred to vain and empty-headed notions).
Biblical
empty; temple of the head
Boy/Male
Hindu, Indian
Empty
Boy/Male
Arabic, Australian, German, Greek, Kurdish
Empty; Void
Girl/Female
Biblical
Void, empty.
Boy/Male
Tamil
One who is empty, Hollow, Vain
Girl/Female
Biblical
Den, cave, making empty.
EMPTY STRING
EMPTY STRING
Boy/Male
Tamil
Living in the forest
Girl/Female
Gujarati, Indian
Intention
Girl/Female
Muslim
Shinning
Girl/Female
Muslim
Boy/Male
Arabic, Gujarati, Indian, Muslim, Parsi, Pashtun, Sindhi, Tamil
Fortunate; The Second Mughal Emperor; Blessed; Auspicious; Sacred; Royal; Imperial
Girl/Female
Tamil
Goddess Saraswati, Indras second wife
Girl/Female
Christian & English(British/American/Australian)
Light
Boy/Male
Indian
Not Having Jealousy
Girl/Female
Arabic, Muslim
One in Millions
Boy/Male
Tamil
Karma before in this birth
EMPTY STRING
EMPTY STRING
EMPTY STRING
EMPTY STRING
EMPTY STRING
superl.
Containing nothing; not holding or having anything within; void of contents or appropriate contents; not filled; -- said of an inclosure, as a box, room, house, etc.; as, an empty chest, room, purse, or pitcher; an empty stomach; empty shackles.
a.
Empty.
n.
An empty box, crate, cask, etc.; -- used in commerce, esp. in transportation of freight; as, "special rates for empties."
v. i.
To become empty.
pl.
of Empty
a.
To empty.
superl.
Destitute of reality, or real existence; unsubstantial; as, empty dreams.
v. t.
To empty.
a.
Empty; frivolous.
superl.
Destitute of effect, sincerity, or sense; -- said of language; as, empty words, or threats.
n.
Love of empty of empty talk or noise.
imp. & p. p.
of Empty
superl.
Destitute of, or lacking, sense, knowledge, or courtesy; as, empty brains; an empty coxcomb.
a.
Empty.
compar.
of Empty.
v. t.
To deprive of the contents; to exhaust; to make void or destitute; to make vacant; to pour out; to discharge; as, to empty a vessel; to empty a well or a cistern.
superl.
Producing nothing; unfruitful; -- said of a plant or tree; as, an empty vine.
p. pr. & vb. n.
of Empty
v. t.
To empty.
v. t.
To empty.