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]
  • Character class intersection
    [\w&&[^\d]]
  • 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
Processing...

Test String

Code Generator

Language

Generated Code

const regex = /(\[((\/.*\/)*\w{0,3}[^\]]+|[^\]]+)\])([\n|\s]*)({{(?:[^}{]+(\/.*\/)*[^}{]+|{{(?:[^}{]+(\/.*\/)*[^}{]+|{{(?:[^}{]+(\/.*\/)*[^}{]+|{{(?:[^}{]+(\/.*\/)*[^}{]+|{{(?:[^}{]+(\/.*\/)*[^}{]+|{{(?:[^}{]+(\/.*\/)*[^}{]+|{{(?:[^}{]+(\/.*\/)*[^}{]+|{{(?:[^}{]+(\/.*\/)*[^}{]+|{{(?:[^}{]+(\/.*\/)*[^}{]+|{{(?:[^}{]+(\/.*\/)*[^}{]+|{{(?:[^}{]+(\/.*\/)*[^}{]+|{{[^}{]*(\/.*\/)*[^}{]*}})*}})*}})*}})*}})*}})*}})*}})*}})*}})*}})*}})*/g; // Alternative syntax using RegExp constructor // const regex = new RegExp('(\\[((\\\/.*\\\/)*\\w{0,3}[^\\]]+|[^\\]]+)\\])([\\n|\\s]*)({{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{(?:[^}{]+(\\\/.*\\\/)*[^}{]+|{{[^}{]*(\\\/.*\\\/)*[^}{]*}})*}})*}})*}})*}})*}})*}})*}})*}})*}})*}})*}})*', 'g') const str = ` [dropdown] {{ <li class="dropdown[submenu]"> <a href="#" tabindex="-1" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"><span class="glyphicon [icone]"></span> [titulo] <span class="caret"></span></a> <ul class="dropdown-menu" role="menu"> [tagmaster] [item|dropdown|novatag|header|divider] [novatag] {{ <li><a href="#" tabindex="-1" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"><span class="glyphicon [icone]"></span> SUPER TAG <span class="caret"></span></a></li> }} [header] {{ <li class="dropdown-header"><span class="glyphicon [icone]"> </span> [titulo]</li> }} [divider] {{ <li role="separator" class="divider"></li> }} [/\\d/gfd|gfg()] </ul> </li> <!-- fim dropdown --> }} [/tagm[a]ster/gfd|gfg()] {{ <div>[teste]</div> }} [item|dropdown] [item] {{ <li[ativo]{{ class="active"}}> <a href="[url]"> <span class="glyphicon [icone]"></span> [titulo] </a> </li> <!-- fim item --> }}`; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; while ((m = regex.exec(str)) !== null) { // This is necessary to avoid infinite loops with zero-width matches if (m.index === regex.lastIndex) { regex.lastIndex++; } // The result can be accessed through the `m`-variable. m.forEach((match, groupIndex) => { console.log(`Found match, group ${groupIndex}: ${match}`); }); }

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 JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions