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

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?m)^(?P<major>[1-9]+\d*)\.(?P<minor>[1-9]+\d*)\.(?P<patch>[1-9]+\d*)(?:-(?P<pre_release>(?:[A-Za-z1-9][A-Za-z0-9\-]*)+(?:\.(?:[A-Za-z1-9][A-Za-z0-9\-]*)+)*))?(?:\+(?P<build_metadata>(?:[A-Za-z1-9][A-Za-z0-9\-]*)+(?:\.(?:[A-Za-z1-9][A-Za-z0-9\-]*)+)*))?$ `) var str = `131.22.33 131.22.33-a.b-t.c.123 131.22.33+abc.oio.a-sd 131.22.33-a.b-t.c.123+abc.oio.a-sd 131.22.33- 131.22.33--a.b-t.c.123 131.22.33+-abc.oio.a-sd 131.22.33++abc.oio.a-sd 131.22.33-a.b-t.c.123++abc.oio.a-sd 131..22.33 131.22.33-a..b-t.c.123 131.22.33+abc..oio.a-sd 131.22.33-a.b-t..c.123+abc.oio.a-sd 0131.22.33 131.022.33-a.b-t.c.123 131.22.033+abc.oio.a-sd 131.22.33-a.b-t.c.123+abc.oio.a-sd+a.b-t.c.123` 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/