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

/
/
g

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`\(*([0-9]{3})\D*([0-9]{3})\D*([0-9]{4})`) var str = `(310) 808-5243 415.846.1688 7203189049 3238886200 323.888.6237 323-888-6209 323/888.6202 3237078576 (323) 216-2201 323.960.3100 7274554538 727-214-5862 727/455.5955 424-209-0017 305-242-4044 (305) 245-1641 8184813655 909.259.5674 (469) 438-2843 323/216.9079 323/953.3340 916-588-8042 7273247922 310.800.3391 4157978909 727.639.0277 323.386.5239 213.840.1971 4242007177 323/816.9831 310-404-5928 323-492-7681 323-833-8515 323-386-5428 (323) 244-3832 310/808.8752 323.855.0394 214/900.6004 727-687-3465 (646) 879-9137 3239533396 323-816-9613 323/816.7010 323.273.5174 323-386-5700 323.386.5699 818-859-4757 727-452-5725 (323) 608-1510 4088294846 323-997-1080 (323) 855-0338 323.717.8673 323/419.6398 3235950799 323-240-2739 ` 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/