JavaScript Regular Expression Tester

This is a simple Regex tester written in Javascript. It's UI is based on that of IntelliJ Regexp Plugin. JavaScript is generated below automatically when you test the expression.

Pattern Text Replace
        
Find output Groups Replace Output 







Generated Javascript


var re = new Regexp();
var txtToReplace = "";

var matchedTrueOrFalse = re.test(txtToReplace));
var matchedIndex = txtToReplace.search(re);
var groupsArray = txtToReplace.match(re);

// if replacement not empty
var replacementResult = exampleText.replace(re, "");







Help



Can often be rather confusing for the newbie.





^Start of String


$End of string



n*Zero or more of 'n'


n+One or more of 'n'


n?A possible 'n'



n{2}Exactly two of 'n'


n{2,}At least 2 or more of 'n'


n{2,4}From 2 to 4 of 'n'



()Parenthesis to group expressions


(n|a)Either 'n' or 'a'



.Any single character



[1-6]A number between 1 and 6


[c-h]A lower case character between c and h


[D-M]An upper case character between D and M


[^a-z]Absence of lower case a to z


[_a-zA-Z]An underscore or any letter of the alphabet






^.{2}[a-z]{1,2}_?[0-9]*([1-6]|[a-f])[^1-9]{2}a+$



A string beginning with any two characters

Followed by either 1 or 2 lower case alphabet letters

Followed by an optional underscore

Followed by zero or more digits

Followed by either a number between 1 and 6 or a character between a and f (Lowercase)

Followed by a two characters which are not digits between 1 and 9

Followed by one or more n characters at the end of a string