Javascript Regular Expression Checker

This form uses javascript on your browser to see the results of regular expressions. I've put the javascript and important css into this html file so all the functionality is in a single local file (nothing is sent to a server). Save this page, or download from the scripts page.

Results

• Modifiers

  g

  search globally

  i

  case insensitive

• Control

  \

  Escape character

  ^

  Beginning (negate for lists)

  $

  End

  *

  zero or more times

  +

  one or more times

  ?

  zero or one time

  |

  or a|b a or b

• Characters

  .

  any character except newline

  \b

  word boundary

  \B

  non-word-boundary

  \d

  numerical digit

  \D

  non-digit

  \f

  form feed

  \n

  unix newline

  \r

  carriage return

  \r\n

  is windows newline

  \s

  white space same as [\f\n\r\t\v]

  \S

  non-white space

  \t

  tab

  \v

  vertical tab

  \w

  letter, number or underscore [a-zA-Z0-9_]

  \W

  not ---do---

  \xnn

  ASCII character nn (hexadecimal)

  \onn

  --do-- (octal)

  \cX

  control character X

  [\b]

  backspace character

• Lists

  [asdfg]

  any of these characters

  [^asdfg]

  not any of these characters

  [a-n]

  any in the range a to n

  {n}

  n occurrences of prev char

  {n,m}

  between n and m occurrences

  {,m}

  up to m occurrences

  {n,}

  at least n occurrences

  ()

  grouping

  $1

  in replace string, refers to groups. Count open parentheses:

  (ab(cd(ef)))(g)
  	$4 is g,
  	$3 is ef,
  	$2 is cd(ef)

Copyleft

copyright © 2011 eightize

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.