Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

$re = '/set \$(\w+)\s+([^\s]+)/m'; $str = '#========= Variables ========= set $win Mod4 set $alt Mod1 set $ws1 "1" set $ws2 "2" set $ws3 "3" set $ws4 "4" set $ws5 "5" set $ws6 "6" set $ws7 "7" set $ws8 "8" set $ws9 "9" set $ws0 "0" set $bar $HOME/.config/polybar/launch.sh set $locker i3lock -i $HOME/.config/i3/bg.png set $term kitty set $menu dmenu -i -l 10 set $browser qutebrowser set $filemanager kitty -e ranger set $launcher dmenu_run set $notify_daemon dunst set $notify_bar_program xob set $notify_bar /tmp/xobpipe set $script $HOME/.config/i3/scripts set $last_action /tmp/i3/last_action set $counter /tmp/i3/counter set $windows /tmp/i3/windows set $current_workspace i3-msg -t get_workspaces | jq -r \'.[] | select(.focused==true).name\' #============================ #======== Autostart ========= exec nm-applet exec kotatogram-desktop exec $browser exec --no-startup-id dunst #============================'; $subst = "\1=\"\2\""; $result = preg_replace($re, $subst, $str); echo "The result of the substitution is ".$result;

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php