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)(?<=:[^:$\n]*)\$\w+(?:-\w+)*`) var str = `.dabur-india{ color: $color-brand-group-3-light !important; .mmm{ background: $color-brand-group-2-dark; $border-dark: rgba($base-color, 0.88); .alert { border: 1px solid $border-dark; } } } $black: #000 !default; $border-radius: 0.25rem !default; $box-shadow: 0 0.5rem 1rem rgba($black, 0.15) !default; code { border-radius: $border-radius; box-shadow: $box-shadow; } @if $dark-theme { $primary-color: darken($primary-color, 60%); $accent-color: lighten($accent-color, 60%); } $theme-colors: ( "success": #28a745, "info": #17a2b8, "warning": #ffc107, ); .alert { // Instead of $theme-color-#{warning} background-color: map.get($theme-colors, "warning"); }` 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/