In formal language theory, the empty string, or empty word, is the unique string of length zero. Formally, a string is a finite, ordered sequence of characters...

ts = hugbear. String concatenation is an associative, but non-commutative operation. The empty string ε serves as the identity element; for any string s, εs =...

terms. A string is a finite sequence of characters. The empty string is denoted by ε {\displaystyle \varepsilon } . The concatenation of two string s {\displaystyle...

common prefix with its parent node, and the root node represents the empty string. While basic trie implementations can be memory-intensive, various optimization...

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...

In computer programming, a null-terminated string is a character string stored as an array containing the characters and terminated with a null character...

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)...

value of zero (integer or fractional), the null value (None), the empty string, and empty containers (lists, sets, etc.) are considered Boolean false; all...

{\displaystyle t=pus} . In particular, the empty string is a substring of every string. Example: The string u = {\displaystyle u=} ana is equal to substrings...

\delta ^{*}(r,\epsilon )=\{r\}} where ϵ {\displaystyle \epsilon } is the empty string, and δ ∗ ( r , x a ) = ⋃ r ′ ∈ δ ∗ ( r , x ) δ ( r ′ , a ) {\displaystyle...

reason is an empty string. If no Close frame was received, event.code is 1006 (Connection closed abnormally) and event.reason is an empty string. ws.onerror...

within a userinfo subcomponent unless the data after the colon is the empty string (indicating no password). A host subcomponent, consisting of either a...

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...

as regular expressions: (empty set) ∅ denoting the set ∅. (empty string) ε denoting the set containing only the "empty" string, which has no characters...

style; tabindex; title; translate) autoplay = "autoplay" or "" (empty string) or empty Instructs the User-Agent to automatically begin playback of the...

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 //...

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...

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...

single-character glyph "NUL") 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...

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...

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...

(*), 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...

In formal language theory and in computer science, lambda denotes the empty string. Lambda is a nonstandard symbol in the International Phonetic Alphabet...

"pp", "pl", "pe", "ppl", "ppe", "ple", "pple", "l", "le", "e", "" (empty string). Given two sequences X {\displaystyle X} and Y , {\displaystyle Y,}...

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...

database implementations. In an Oracle RDBMS, for example, NULL and the empty string are considered the same thing and therefore 'Fish ' || NULL || 'Chips'...

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...

} and γ {\displaystyle \gamma } represent any string of both terminals and non-terminals (possibly empty). The prefix length corresponds to the lookahead...

delimiters) to specify string literals. Double quotations are the most common quoting delimiters used: "Hi There!" An empty string is literally written...

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...