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

r"
"
gmi

Test String

Code Generator

Language

Generated Code

const regex = new RegExp('(?<=\\b)\\w([\\w\\.\\-_0-9])*(@| at )[\\w0-9][\\w\\-_0-9]*((\\.| DOT )[\\w\\-_0-9]+)+(?=\\b)', 'gmi') const str = `test@email.com test-user@email.com test.user@email.com 33test33@email.com test99user-_22@email.com test@e.mail test@g.mail test AT email.com test AT email DOT com test AT email dot com test at email.com test@email DOT com this is not an email @twitterUser this is just an an string el@ Valid ------- first.last@iana.org 1234567890123456789012345678901234567890123456789012345678901234@iana.org x@x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x2 1234567890123456789012345678901234567890123456789012345678@12345678901234567890123456789012345678901234567890123456789.12345678901234567890123456789012345678901234567890123456789.123456789012345678901234567890123456789012345678901234567890123.iana.org user+mailbox@iana.org customer/department@iana.org customer/department=shipping@iana.org cal(woo(yay)hoopla)@iamcal.com cal(foo\\@bar)@iamcal.com cal(foo\\)bar)@iamcal.com first(Welcome to&#13;&#10; the ("wonderful" (!)) world&#13;&#10; of email)@iana.org pete(his account)@silly.test(his host) c@(Chris's host.)public.example Invalid --------- first@...........com first.last@sub.do,com first\\@last@iana.org first.last .first.last@iana.org first.last.@iana.org "first"last"@iana.org """@iana.org first\\\\@last@iana.org Doug\\ \\"Ace\\"\\ Lovell@iana.org ()[]\\;:,><@iana.org test@. test@[123.123.123.123 test@123.123.123.123]`; // 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