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

/
/
gmi

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?mi)\b[A-Z0-9._%+-]+(\s*@\s*|\s*[@\[\{\(]*(\s*(@)\s*|\s+([@\[\{\(]*at[\]\}\)]*)\s+)[\]\}\)]*\s*)([A-Z0-9-])+((\s*[\[\{\(]*\s*(dot|\.)\s*[\]\}\)]*\s*)+[A-Z]{2,6})+\b`) var str = `Hello hi_there@gmail.com, welcome to Gskinner! Hello hi_there [at] gmail [dot] com, welcome to Gskinner! Hello hi_there (at) gmail (dot) co (dot) uk, welcome to Gskinner! Hello jam+jim @ googlemail.com, welcome to Gskinner! Hello heythere {at} guardian [dot] co (dot) uk, welcome to Gskinner! Hello contact [[[@]]] jazzit (dot) hr, welcome to Gskinner! obfuscated_emails = [ "moo@doo.com", "m_oo@doo.co.uk", "moo @@ doo.com", "moo @ doo . com", "moo @ doo.com", "moo@doo . com", "moo@doo . co . uk", "moo@doo. co. uk", "m_oo @ doo.com", "moo [at] doo.com", "moo [at] doo . com", "moo [at] doo [dot] com", "m_oo [at] doo [dot] co [dot] uk", "moo at doo.com", "moo at doo . co . uk", "m_oo at doo . com", "moo at doo dot com" ] Email him directly at firstname.lastname@companyname.com word wordWithAtintheend. anotherword roofcrafters-certifications.jpg , location.href ` for i, match := range re.FindAllString(str, -1) { fmt.Println(match, "found at index", i) } }

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 Golang, please visit: https://golang.org/pkg/regexp/