Introduction - If you have any usage issues, please Google them yourself
In computer science, refers to a series of line used to describe or match a string of syntactic rules a single string. In many text editors or other tools, the regular expression is generally used to retrieve and/or replace those text matches a pattern. Many programming languages support the use of regular expressions for string manipulation. For example, the built-in Perl on a powerful regular expression engine. This concept of regular expressions was originally developed by the Unix software tools (such as sed and grep) spread open. Regular expressions are usually abbreviated as "regex", singular there regexp, regex, plural have regexps, regexes, regexen.