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(`[2-9][0-9][`) var str = ` drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:10 /raw/ADS/ClicksData/click/datetm=2017-10-15 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:35 /raw/ADS/ClicksData/click/datetm=2017-10-16 drwxrwxr-x - testetl hdp_test 0 2018-01-31 21:54 /raw/ADS/ClicksData/click/datetm=2017-10-17 drwxrwxr-x - testetl hdp_test 0 2018-01-31 23:59 /raw/ADS/ClicksData/click/datetm=2017-10-18 drwxrwxr-x - testetl hdp_test 0 2018-01-31 21:49 /raw/ADS/ClicksData/click/datetm=2017-10-19 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:32 /raw/ADS/ClicksData/click/datetm=2017-10-20 drwxrwxr-x - testetl hdp_test 0 2018-02-02 11:51 /raw/ADS/ClicksData/click/datetm=2017-10-21 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:08 /raw/ADS/ClicksData/click/datetm=2017-10-22 drwxrwxr-x - testetl hdp_test 0 2018-01-31 22:42 /raw/ADS/ClicksData/click/datetm=2017-10-23 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:58 /raw/ADS/ClicksData/click/datetm=2017-10-24 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:10 /raw/ADS/ClicksData/click/datetm=2017-10-25 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:46 /raw/ADS/ClicksData/click/datetm=2017-10-26 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:04 /raw/ADS/ClicksData/click/datetm=2017-10-27 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:46 /raw/ADS/ClicksData/click/datetm=2017-10-28 drwxrwxr-x - testetl hdp_test 0 2018-02-02 00:21 /raw/ADS/ClicksData/click/datetm=2017-10-29 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:09 /raw/ADS/ClicksData/click/datetm=2017-10-30 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:13 /raw/ADS/ClicksData/click/datetm=2017-10-31 drwxrwxr-x - testetl hdp_test 0 2018-02-01 14:34 /raw/ADS/ClicksData/click/datetm=2017-11-01 drwxrwxr-x - testetl hdp_test 0 2018-02-02 09:20 /raw/ADS/ClicksData/click/datetm=2017-11-02 drwxrwxr-x - testetl hdp_test 0 2018-02-01 14:35 /raw/ADS/ClicksData/click/datetm=2017-11-03 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:42 /raw/ADS/ClicksData/click/datetm=2017-11-04 drwxrwxr-x - testetl hdp_test 0 2018-02-02 09:18 /raw/ADS/ClicksData/click/datetm=2017-11-05 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:11 /raw/ADS/ClicksData/click/datetm=2017-11-06 drwxrwxr-x - testetl hdp_test 0 2018-01-31 17:56 /raw/ADS/ClicksData/click/datetm=2017-11-07 drwxrwxr-x - testetl hdp_test 0 2018-01-31 21:36 /raw/ADS/ClicksData/click/datetm=2017-11-08 drwxrwxr-x - testetl hdp_test 0 2018-01-31 16:43 /raw/ADS/ClicksData/click/datetm=2017-11-09 drwxrwxr-x - testetl hdp_test 0 2018-01-31 21:59 /raw/ADS/ClicksData/click/datetm=2017-11-10 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:23 /raw/ADS/ClicksData/click/datetm=2017-11-11 drwxrwxr-x - testetl hdp_test 0 2018-02-02 09:15 /raw/ADS/ClicksData/click/datetm=2017-11-12 drwxrwxr-x - testetl hdp_test 0 2018-02-01 00:32 /raw/ADS/ClicksData/click/datetm=2017-11-13 drwxrwxr-x - testetl hdp_test 0 2018-02-02 00:23 /raw/ADS/ClicksData/click/datetm=2017-11-14 drwxrwxr-x - testetl hdp_test 0 2018-02-02 08:57 /raw/ADS/ClicksData/click/datetm=2017-11-15 drwxrwxr-x - testetl hdp_test 0 2018-01-31 22:40 /raw/ADS/ClicksData/click/datetm=2017-11-16 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:09 /raw/ADS/ClicksData/click/datetm=2017-11-17 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:08 /raw/ADS/ClicksData/click/datetm=2017-11-18 drwxrwxr-x - testetl hdp_test 0 2018-01-31 22:59 /raw/ADS/ClicksData/click/datetm=2017-11-19 drwxrwxr-x - testetl hdp_test 0 2018-01-31 21:44 /raw/ADS/ClicksData/click/datetm=2017-11-20 drwxrwxr-x - testetl hdp_test 0 2018-01-31 20:08 /raw/ADS/ClicksData/click/datetm=2017-11-21 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:12 /raw/ADS/ClicksData/click/datetm=2017-11-22 drwxrwxr-x - testetl hdp_test 0 2018-02-02 11:52 /raw/ADS/ClicksData/click/datetm=2017-11-23 drwxrwxr-x - testetl hdp_test 0 2018-01-31 22:57 /raw/ADS/ClicksData/click/datetm=2017-11-24 drwxrwxr-x - testetl hdp_test 0 2018-01-31 21:57 /raw/ADS/ClicksData/click/datetm=2017-11-25 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:28 /raw/ADS/ClicksData/click/datetm=2017-11-26 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:22 /raw/ADS/ClicksData/click/datetm=2017-11-27 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:04 /raw/ADS/ClicksData/click/datetm=2017-11-28 drwxrwxr-x - testetl hdp_test 0 2018-01-31 05:28 /raw/ADS/ClicksData/click/datetm=2017-11-29 drwxrwxr-x - testetl hdp_test 0 2018-01-31 23:59 /raw/ADS/ClicksData/click/datetm=2017-11-30 drwxrwxr-x - testetl hdp_test 0 2018-01-31 23:57 /raw/ADS/ClicksData/click/datetm=2017-12-01 drwxrwxr-x - testetl hdp_test 0 2018-01-31 22:43 /raw/ADS/ClicksData/click/datetm=2017-12-02 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:28 /raw/ADS/ClicksData/click/datetm=2017-12-03 drwxrwxr-x - testetl hdp_test 0 2018-02-01 00:54 /raw/ADS/ClicksData/click/datetm=2017-12-04 drwxrwxr-x - testetl hdp_test 0 2018-02-02 08:54 /raw/ADS/ClicksData/click/datetm=2017-12-05 drwxrwxr-x - testetl hdp_test 0 2018-02-02 08:52 /raw/ADS/ClicksData/click/datetm=2017-12-06 drwxrwxr-x - testetl hdp_test 0 2018-02-01 07:23 /raw/ADS/ClicksData/click/datetm=2017-12-07 drwxrwxr-x - testetl hdp_test 0 2018-02-01 07:21 /raw/ADS/ClicksData/click/datetm=2017-12-08 drwxrwxr-x - testetl hdp_test 0 2018-02-06 11:39 /raw/ADS/ClicksData/click/datetm=2017-12-09 drwxrwxr-x - testetl hdp_test 0 2018-01-31 22:31 /raw/ADS/ClicksData/click/datetm=2017-12-10 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:57 /raw/ADS/ClicksData/click/datetm=2017-12-11 drwxrwxr-x - testetl hdp_test 0 2018-01-31 22:22 /raw/ADS/ClicksData/click/datetm=2017-12-12 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:13 /raw/ADS/ClicksData/click/datetm=2017-12-13 drwxrwxr-x - testetl hdp_test 0 2018-01-31 16:33 /raw/ADS/ClicksData/click/datetm=2017-12-14 drwxrwxr-x - testetl hdp_test 0 2018-01-31 23:49 /raw/ADS/ClicksData/click/datetm=2017-12-15 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:24 /raw/ADS/ClicksData/click/datetm=2017-12-16 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:42 /raw/ADS/ClicksData/click/datetm=2017-12-17 drwxrwxr-x - testetl hdp_test 0 2018-02-02 08:59 /raw/ADS/ClicksData/click/datetm=2017-12-18 drwxrwxr-x - testetl hdp_test 0 2018-02-01 14:36 /raw/ADS/ClicksData/click/datetm=2017-12-19 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:10 /raw/ADS/ClicksData/click/datetm=2017-12-20 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:43 /raw/ADS/ClicksData/click/datetm=2017-12-21 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:13 /raw/ADS/ClicksData/click/datetm=2017-12-22 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:06 /raw/ADS/ClicksData/click/datetm=2017-12-23 drwxrwxr-x - testetl hdp_test 0 2018-02-02 09:14 /raw/ADS/ClicksData/click/datetm=2017-12-24 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:03 /raw/ADS/ClicksData/click/datetm=2017-12-25 drwxrwxr-x - testetl hdp_test 0 2018-01-31 22:37 /raw/ADS/ClicksData/click/datetm=2017-12-26 drwxrwxr-x - testetl hdp_test 0 2018-02-01 14:34 /raw/ADS/ClicksData/click/datetm=2017-12-27 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:12 /raw/ADS/ClicksData/click/datetm=2017-12-28 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:32 /raw/ADS/ClicksData/click/datetm=2017-12-29 drwxrwxr-x - testetl hdp_test 0 2018-01-31 18:00 /raw/ADS/ClicksData/click/datetm=2017-12-30 drwxrwxr-x - testetl hdp_test 0 2018-01-31 21:45 /raw/ADS/ClicksData/click/datetm=2017-12-31 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:08 /raw/ADS/ClicksData/click/datetm=2018-01-01 drwxrwxr-x - testetl hdp_test 0 2018-02-01 00:32 /raw/ADS/ClicksData/click/datetm=2018-01-02 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:43 /raw/ADS/ClicksData/click/datetm=2018-01-03 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:10 /raw/ADS/ClicksData/click/datetm=2018-01-04 drwxrwxr-x - testetl hdp_test 0 2018-02-01 14:34 /raw/ADS/ClicksData/click/datetm=2018-01-05 drwxrwxr-x - testetl hdp_test 0 2018-02-02 09:01 /raw/ADS/ClicksData/click/datetm=2018-01-06 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:29 /raw/ADS/ClicksData/click/datetm=2018-01-07 drwxrwxr-x - testetl hdp_test 0 2018-02-01 08:59 /raw/ADS/ClicksData/click/datetm=2018-01-08 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:45 /raw/ADS/ClicksData/click/datetm=2018-01-09 drwxrwxr-x - testetl hdp_test 0 2018-02-01 08:57 /raw/ADS/ClicksData/click/datetm=2018-01-10 drwxrwxr-x - testetl hdp_test 0 2018-01-31 23:59 /raw/ADS/ClicksData/click/datetm=2018-01-11 drwxrwxr-x - testetl hdp_test 0 2018-02-01 14:36 /raw/ADS/ClicksData/click/datetm=2018-01-12 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:29 /raw/ADS/ClicksData/click/datetm=2018-01-13 drwxrwxr-x - testetl hdp_test 0 2018-01-31 22:57 /raw/ADS/ClicksData/click/datetm=2018-01-14 drwxrwxr-x - testetl hdp_test 0 2018-01-31 22:35 /raw/ADS/ClicksData/click/datetm=2018-01-15 drwxrwxr-x - testetl hdp_test 0 2018-01-31 21:49 /raw/ADS/ClicksData/click/datetm=2018-01-16 drwxrwxr-x - testetl hdp_test 0 2018-02-02 11:51 /raw/ADS/ClicksData/click/datetm=2018-01-17 drwxrwxr-x - testetl hdp_test 0 2018-02-01 07:24 /raw/ADS/ClicksData/click/datetm=2018-01-18 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:46 /raw/ADS/ClicksData/click/datetm=2018-01-19 drwxrwxr-x - testetl hdp_test 0 2018-02-02 09:22 /raw/ADS/ClicksData/click/datetm=2018-01-20 drwxrwxr-x - testetl hdp_test 0 2018-02-01 08:29 /raw/ADS/ClicksData/click/datetm=2018-01-21 drwxrwxr-x - testetl hdp_test 0 2018-02-02 08:55 /raw/ADS/ClicksData/click/datetm=2018-01-22 drwxrwxr-x - testetl hdp_test 0 2018-02-01 08:29 /raw/ADS/ClicksData/click/datetm=2018-01-23 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:58 /raw/ADS/ClicksData/click/datetm=2018-01-24 drwxrwxr-x - testetl hdp_test 0 2018-01-31 21:46 /raw/ADS/ClicksData/click/datetm=2018-01-25 drwxrwxr-x - testetl hdp_test 0 2018-02-01 09:14 /raw/ADS/ClicksData/click/datetm=2018-01-26 drwxrwxr-x - testetl hdp_test 0 2018-02-01 02:16 /raw/ADS/ClicksData/click/datetm=2018-01-27 drwxrwxr-x - testetl hdp_test 0 2018-02-02 05:12 /raw/ADS/ClicksData/click/datetm=2018-01-28 drwxrwxr-x - testetl hdp_test 0 2018-02-01 00:59 /raw/ADS/ClicksData/click/datetm=2018-01-29 drwxrwxr-x - testetl hdp_test 0 2018-02-06 11:41 /raw/ADS/ClicksData/click/datetm=2018-01-30 drwxrwxr-x - testetl hdp_test 0 2018-02-06 13:48 /raw/ADS/ClicksData/click/datetm=2018-01-31 drwxrwxr-x - testetl hdp_test 0 2018-02-06 13:48 /raw/ADS/ClicksData/click/datetm=2018-02-01 drwxrwxr-x - testetl hdp_test 0 2018-02-06 20:24 /raw/ADS/ClicksData/click/datetm=2018-02-02 drwxrwxr-x - testetl hdp_test 0 2018-02-06 19:26 /raw/ADS/ClicksData/click/datetm=2018-02-03 drwxrwxr-x - testetl hdp_test 0 2018-02-06 19:26 /raw/ADS/ClicksData/click/datetm=2018-02-04 drwxrwxr-x - testetl hdp_test 0 2018-02-06 19:26 /raw/ADS/ClicksData/click/datetm=2018-02-05 drwxrwxr-x - testetl hdp_test 0 2018-02-06 21:23 /raw/ADS/ClicksData/click/datetm=2018-02-06 drwxrwxr-x - testetl hdp_test 0 2018-02-07 20:41 /raw/ADS/ClicksData/click/datetm=2018-02-07 drwxrwxr-x - testetl hdp_test 0 2018-02-08 20:46 /raw/ADS/ClicksData/click/datetm=2018-02-08 drwxrwxr-x - testetl hdp_test 0 2018-02-09 21:17 /raw/ADS/ClicksData/click/datetm=2018-02-09 drwxrwxr-x - testetl hdp_test 0 2018-02-10 21:34 /raw/ADS/ClicksData/click/datetm=2018-02-10 drwxrwxr-x - testetl hdp_test 0 2018-02-11 20:53 /raw/ADS/ClicksData/click/datetm=2018-02-11 drwxrwxr-x - testetl hdp_test 0 2018-02-12 23:06 /raw/ADS/ClicksData/click/datetm=2018-02-12 drwxrwxr-x - testetl hdp_test 0 2018-02-13 22:23 /raw/ADS/ClicksData/click/datetm=2018-02-13 drwxrwxr-x - testetl hdp_test 0 2018-02-14 23:50 /raw/ADS/ClicksData/click/datetm=2018-02-14 drwxrwxr-x - testetl hdp_test 0 2018-02-15 23:10 /raw/ADS/ClicksData/click/datetm=2018-02-15 drwxrwxr-x - testetl hdp_test 0 2018-02-16 21:53 /raw/ADS/ClicksData/click/datetm=2018-02-16 drwxrwxr-x - testetl hdp_test 0 2018-02-17 21:57 /raw/ADS/ClicksData/click/datetm=2018-02-17 drwxrwxr-x - testetl hdp_test 0 2018-02-18 21:59 /raw/ADS/ClicksData/click/datetm=2018-02-18 drwxrwxr-x - testetl hdp_test 0 2018-02-19 22:09 /raw/ADS/ClicksData/click/datetm=2018-02-19 drwxrwxr-x - testetl hdp_test 0 2018-02-20 09:13 /raw/ADS/ClicksData/click/datetm=2018-02-20 ` 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/