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)\s+R\*$`) var str = `------------- ---UPLOADS--- ------------- SESSION|01/09/2017 15:35:42.143|[SFTP:1060257_0:it:10.87.16.71] WROTE: *150 Opening BINARY mode data connection. Ready to write file /it/cpp. "/it/cpp") S T O R* SESSION|01/09/2017 15:35:42.890|[SFTP:1060257_0:it:10.87.16.71] READ: *STOR END /it/cpp:PENs3* SESSION|01/09/2017 15:35:43.133|226-Upload File Size:1571846 bytes @ 1535K/sec. MD5=8438660f668ceb3de586cd7ef1263bc4 --- SESSION|01/09/2017 15:35:42.143|[SFTP:1060257_0:it:10.87.16.71] WROTE: *150 Opening BINARY mode data connection. Ready to write file /it/cpp. "/it/cpp") S T O R* SESSION|01/09/2017 15:35:43.133|226-Upload File Size:1571846 bytes @ 1535K/sec. MD5=8438660f668ceb3de586cd7ef1263bc4 SESSION|01/09/2017 15:35:42.890|[SFTP:1060257_0:it:10.87.16.71] READ: *STOR END /it/cpp:PENs3* --- SESSION|12/20/2016 15:12:26.273|[SFTP:1008699_0:it:10.87.16.71] WROTE: *150 Opening BINARY mode data connection. Ready to write file /it/cpp. "/it/cpp") S T O R* SESSION|12/20/2016 15:12:26.299|226-Upload File Size:25 bytes @ 0K/sec. MD5=7e5e5560ab14904d5f5b2af5fcd8bec3 SESSION|12/20/2016 15:12:26.299|[SFTP:1008699_0:it:10.87.16.71] WROTE: *226 Transfer complete. MD5=7e5e5560ab14904d5f5b2af5fcd8bec3 ("/it/cpp" 25) STOR* --------------- ---DOWNLOADS--- --------------- SESSION|01/17/2017 18:19:25.566|[SFTP:1073958_0:ss.irth.test:10.87.16.71] WROTE: *150 Opening BINARY mode data connection for /test/cpp (25 bytes). ("/test/cpp") R E T R* SESSION|01/17/2017 18:19:25.767|226-Download File Size:25 bytes @ 0K/sec. SESSION|01/17/2017 18:19:25.768|[SFTP:1073958_0:ss.irth.test:10.87.16.71] WROTE: *226 Transfer complete. MD5=7e5e5560ab14904d5f5b2af5fcd8bec3 ("/test/cpp") RETR* --- SESSION|01/17/2017 18:19:26.147|[SFTP:1073958_0:ss.irth.test:10.87.16.71] WROTE: *150 Opening BINARY mode data connection for /test/cpp (25 bytes). ("/test/cpp") R E T R* SESSION|01/17/2017 18:19:26.173|226-Download File Size:25 bytes @ 0K/sec. SESSION|01/17/2017 18:19:26.174|[SFTP:1073958_0:ss.irth.test:10.87.16.71] WROTE: *226 Transfer complete. MD5=7e5e5560ab14904d5f5b2af5fcd8bec3 ("/test/cpp") RETR* --- SESSION|01/17/2017 18:19:26.614|[SFTP:1073958_0:ss.irth.test:10.87.16.71] WROTE: *150 Opening BINARY mode data connection for /test/cpp (25 bytes). ("/test/cpp") R E T R* SESSION|01/17/2017 18:19:26.736|226-Download File Size:25 bytes @ 0K/sec. SESSION|01/17/2017 18:19:26.737|[SFTP:1073958_0:ss.irth.test:10.87.16.71] WROTE: *226 Transfer complete. MD5=7e5e5560ab14904d5f5b2af5fcd8bec3 ("/test/cpp") RETR*a` 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/