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In computer programming, string interpolation (or variable interpolation, variable substitution, or variable expansion) is the process of evaluating a string literal containing one or more placeholders, yielding a result in which the placeholders are replaced with their corresponding values.
String functions are used in computer programming languages to manipulate a string or query information about a string (some do both).. Most programming languages that have a string datatype will have some string functions although there may be other low-level ways within each language to handle strings directly.
The Burrows–Wheeler transform (BWT, also called block-sorting compression) rearranges a character string into runs of similar characters. This is useful for compression, since it tends to be easy to compress a string that has runs of repeated characters by techniques such as move-to-front transform and run-length encoding.
Strings are typically made up of characters, and are often used to store human-readable data, such as words or sentences.. In computer programming, a string is traditionally a sequence of characters, either as a literal constant or as some kind of variable.
The practice of always using references in place of copies of equal objects is known as interning. If interning is used, two objects are considered equal if and only if their references, typically represented as pointers or integers, are equal. Some languages do this automatically: for example, Python automatically interns short strings. If the ...
Find and replace may refer to: a feature of text processing as found: in text editors; in formal language theory; in particular programming languages;
A simple and inefficient way to see where one string occurs inside another is to check at each index, one by one. First, we see if there is a copy of the needle starting at the first character of the haystack; if not, we look to see if there's a copy of the needle starting at the second character of the haystack, and so forth.
Hopcroft and Ullman (1979) define the quotient L 1 /L 2 of the languages L 1 and L 2 over the same alphabet as L 1 /L 2 = { s | ∃t∈L 2. st ∈ L 1 } . [ 7 ] This is not a generalization of the above definition, since, for a string s and distinct characters a , b , Hopcroft's and Ullman's definition implies yielding {}, rather than { ε }.