Javascript Regular Expression Checker

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)