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

/
/
ix

Test String

Code Generator

Language

Generated Code

const regex = /^(https?:\/\/)? # optional scheme ((?:[-a-z0-9._~!$&\'()*+,;=]|%[0-9a-f]{2})+ # optional username@, (?::(?:[-a-z0-9._~!$&\'()*+,;=]|%[0-9a-f]{2})+)?@)? # or username:password@ (?:((?:(?:\d|[1-9]\d|1\d{2}|2[0-4]\d|25[0-5])\.){3}(?:\d|[1-9]\d|1\d{2}|2[0-4]\d|25[0-5])) # IPv4 address |((?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z][a-z0-9-]*[a-z0-9])) # or dot-separated domain labels (:\d+)? # optional port number ((?:\/(?:[-a-z0-9._~!$&\'()*+,;=:@]|%[0-9a-f]{2})+)*\/?) # path (possibly empty, may end in /, no double-// allowed) (\?(?:[-a-z0-9._~!$&\'()*+,;=:@\/?]|%[0-9a-f]{2})*)? # optional querystring (\#(?:[-a-z0-9._~!$&\'()*+,;=:@\/?]|%[0-9a-f]{2})*)?$ # optional fragment/i; // Alternative syntax using RegExp constructor // const regex = new RegExp('^(https?:\\\/\\\/)? # optional scheme ((?:[-a-z0-9._~!$&\\\'()*+,;=]|%[0-9a-f]{2})+ # optional username@, (?::(?:[-a-z0-9._~!$&\\\'()*+,;=]|%[0-9a-f]{2})+)?@)? # or username:password@ (?:((?:(?:\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])\\.){3}(?:\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])) # IPv4 address |((?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z][a-z0-9-]*[a-z0-9])) # or dot-separated domain labels (:\\d+)? # optional port number ((?:\\\/(?:[-a-z0-9._~!$&\\\'()*+,;=:@]|%[0-9a-f]{2})+)*\\\/?) # path (possibly empty, may end in \/, no double-\/\/ allowed) (\\?(?:[-a-z0-9._~!$&\\\'()*+,;=:@\\\/?]|%[0-9a-f]{2})*)? # optional querystring (\\#(?:[-a-z0-9._~!$&\\\'()*+,;=:@\\\/?]|%[0-9a-f]{2})*)?$ # optional fragment', 'i') const str = `www.hwholdsworth.com:80/a/b/c?j=k#z`; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; if ((m = regex.exec(str)) !== null) { // 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