Regular Expressions is a query language created in 1951.

A regular expression, regex or regexp (sometimes called a rational expression) is, in theoretical computer science and formal language theory, a sequence of characters that define a search pattern. Usually this pattern is then used by string searching algorithms for "find" or "find and replace" operations on strings. The concept arose in the 1950s when the American mathematician Stephen Cole Kleene formalized the description of a regular language. Read more on Wikipedia...

• Regular Expressions Wikipedia page
• There are at least 58,614 Regular Expressions repos on GitHub
• Regular Expressions first developed in University of Wisconsin-Madison
• file extensions for Regular Expressions include regexp and regex
• There are 5,278 members in the Regular Expressions subreddit
• GitHub supports syntax highlighting for Regular Expressions
• See also: (28 related languages)Unix, Perl, sed, awk, ASCII, SNOBOL, grep, vi, Emacs, Tcl, PostgreSQL, Unicode, Perl 6, PEG, SGML, PCRE, PHP, Java, Python, ECMAScript, Linux, Vim, JavaScript, Ruby, C, Lisp, UTF-8, ISBN