Regular Expressions 101

Save & Manage Regex

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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
Processing...

Test String

Code Generator

Language

Generated Code

$re = '/\b10\.19[1-4]\.\d+\.\d+/m'; $str = '172.31.255.2 Jan 22 20:29:55 local0 info 1 2019 Jan 22 17:29:54 ANK-IGW_LC7_Internet1 - - NAT44 - [SessionbasedAD 6 10.194.97.168 internet1 - 185.106.28.145 19691 15821 - 185.60.216.35 443 ][SessionbasedAD 6 10.194.97.168 internet1 - 185.106.28.145 57156 29896 - 185.60.216.11 443 ][SessionbasedAD 6 10.193.1.203 internet1 - 185.106.28.121 43201 9340 - 146.0.239.19 443 ][SessionbasedAD 17 10.191.35.247 internet1 - 185.106.28.169 22729 11691 - 93.91.201.207 53 ][SessionbasedAD 6 10.191.5.249 internet1 - 185.106.28.97 5541 56078 - 95.170.215.120 80 ][SessionbasedAD 6 10.191.8.140 internet1 - 185.106.28.73 4319 15989 - 5.129.235.102 55820 ][SessionbasedAD 6 10.195.0.168 internet1 - 185.106.28.1 36823 47893 - 216.58.212.46 443 ][SessionbasedAD 17 10.194.131.2 internet1 - 185.106.28.49 54713 43535 - 212.237.115.209 443 ][SessionbasedAD 6 10.193.1.179 internet1 - 185.106.28.145 47574 8226 - 130.193.149.19 443 ][SessionbasedAD 17 10.191.192.220 internet1 - 185.106.28.121 16709 49433 - 93.91.201.207 53 ][SessionbasedAD 6 10.193.1.179 internet1 - 185.106.28.145 35656 47013 - 130.193.149.11 443 ][SessionbasedAD 17 10.191.8.140 internet1 - 185.106.28.73 15989 25885 - 39.42.98.88 62066 ][SessionbasedAD 6 10.194.99.170 internet1 - 185.106.28.1 39010 9907 - 172.217.169.180 443 ][SessionbasedAD 6 10.195.8.136 internet1 - 185.106.28.193 39866 56438 - 212.237.115.33 443 ] 172.31.255.2 Jan 22 20:29:55 local0 info 1 2019 Jan 22 17:29:54 ANK-IGW_LC7_Internet1 - - NAT44 - [SessionbasedAD 6 10.191.7.99 internet1 - 185.106.28.161 3471 9214 - 130.193.149.17 80 ][SessionbasedWD 6 10.195.3.115 internet1 - 185.106.28.65 4021 46771 - 216.239.36.126 443 ][SessionbasedWD 6 10.191.4.152 internet1 - 185.106.28.209 45775 3524 - 88.85.66.146 443 ][SessionbasedWD 17 10.191.100.160 internet1 - 185.106.28.41 26447 13671 - 93.91.201.207 53 ][SessionbasedAD 6 10.191.7.99 internet1 - 185.106.28.161 54379 27461 - 130.193.149.8 80 ][SessionbasedWD 6 10.193.2.24 internet1 - 185.106.28.209 1525 58284 - 80.67.85.29 443 ][SessionbasedWD 6 10.193.2.24 internet1 - 185.106.28.209 48488 42817 - 80.67.85.29 443 ][SessionbasedWD 6 10.193.2.24 internet1 - 185.106.28.209 48486 59626 - 80.67.85.29 443 ][SessionbasedWD 6 10.193.2.24 internet1 - 185.106.28.209 48494 22776 - 80.67.85.29 443 ][SessionbasedWD 6 10.195.5.37 internet1 - 185.106.28.65 6493 51461 - 185.60.216.52 443 ][SessionbasedWD 17 10.194.100.133 internet1 - 185.106.28.113 63561 17683 - 119.28.52.85 8011 ][SessionbasedWD 6 10.193.6.28 internet1 - 185.106.28.17 54066 20671 - 185.60.216.19 443 ][SessionbasedWD 6 10.195.5.117 internet1 - 185.106.28.209 1893 5015 - 212.237.115.33 443 ][SessionbasedWD 6 10.194.130.163 internet1 - 185.106.28.65 36203 65366 - 172.217.169.162 443 ][SessionbasedWD 6 10.191.5.233 internet1 - 185.106.28.41 50332 25093 - 185.60.216.19 443 ]'; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); // Print the entire match result var_dump($matches);

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 PHP, please visit: http://php.net/manual/en/ref.pcre.php