Regular expression

Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects.

A regular expression sometimes referred to as rational expression, is a sequence of characters that specifies a match pattern in text.

Alternation is the term in regular expression that is actually a simple “OR”. In a regular expression it is denoted with a vertical line character |.

In this article. A regular expression is a pattern that the regular expression engine attempts to match in input text. Character Classes · NET Regular Expressions · Character Escapes · Options

Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns.

' | ' is used to or-ing two regular expression. I created a regex /^a*|b*$/ , and I want it to detect any string that contains only charater of 'a' or 'b'.

I'm going to assume you want to build a the regex dynamically to contain other words than part1 and part2, and that you want order not to ...

Example to create logical or or || operations in regular expressions - a simple tutorial as part of the OCPsoft regular expressions guide.

A RegEx, or Regular Expression, is a sequence of characters that forms a search pattern. RegEx can be used to check if a string contains the specified ... Python PIP · Try it Yourself · Try it

Regular Expression, or regex or regexp in short, is extremely and amazingly powerful in searching and manipulating text strings, particularly in processing ...