Every regular expression can be broken down into a sequence of instructions.Bearing this in mind, it shouldn't surprise you to learn that: The string is actually an extremely tiny computer program, and regular expression syntax is a small, terse, domain-specific programming language. There's no length limit, but typically the string is quite short. Some programming languages (Perl, JavaScript) even provide dedicated syntax for regular expression operations.Ī regular expression is just a string. In this context "the text" is just a string variable, but the operations available are the same. substrings) out of the textĪs well as text editors, almost every high-level programming language includes support for regular expressions. find those pattern matches, if there are any.check whether the text contains a certain pattern.Regular expressions are used when editing text in a text editor, to: Regular expressions ("regexes") are supercharged Find/Replace string operations.
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