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 = '/\n^\s{16,}/m'; $str = '{ "bulbasaur": { "num": 1, "name": "Bulbasaur", "slug": "bulbasaur", "generation": 1, "forms": { "bulbasaur": { "name": "Bulbasaur", "slug": "bulbasaur", "formName": null, "formSlug": null, "showdownName": "Bulbasaur", "generation": 1, "sprite": "0001-0100/0001", "menuSprite": "bulbasaur", "isDefault": true, "isFemale": false, "isCosmetic": false, "isBattleOnly": false, "isCloudStorable": true, "isFusion": false, "isMega": false, "isPrimal": false, "isGigantamax": false, "isTotem": false, "isRegional": false, "hasGenderDifferences": false, "hasGmax": false, "hasMega": false, "data": { "gen8": { "generation": 8, "type1": "grass", "type2": "poison", "eggGroup1": "monster", "eggGroup2": "grass", "ability1": "overgrow", "ability2": null, "abilityHidden": "chlorophyll", "height": 0.7, "weight": 6.9, "color": "green", "shape": "?", "maleRatio": 0.875, "femaleRatio": 0.125, "baseHp": 45, "baseAttack": 49, "baseDefense": 49, "baseSpAttack": 65, "baseSpDefense": 65, "baseSpeed": 45, "baseStatsTotal": 318, "weightPercentile": 26.85337726523888, "heightPercentile": 37.191103789126856, "baseHpPercentile": 14.209225700164746, "baseAttackPercentile": 13.797364085667216, "baseDefensePercentile": 17.751235584843492, "baseSpAttackPercentile": 44.275123558484346, "baseSpDefensePercentile": 40.362438220757824, "baseSpeedPercentile": 22.03459637561779, "baseStatsTotalPercentile": 18.57495881383855 } } } }, "formsOrder": [ "bulbasaur" ] } }'; $subst = " "; $result = preg_replace($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