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