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
Processing...

Test String

Code Generator

Language

Generated Code

$re = '/all\s+(\S+\s+){2}(?<field1>[\d\.]+)/m'; $str = ' 10/1/2017 0:10:01 all 9.13 0 1.68 6.6 0 82.59 10/1/2017 0:20:01 all 7.46 0 0 5.74 0 85.17 10/1/2017 0:30:01 all 9.05 0 129 1.53 0 88.13 10/1/2017 0:40:01 all 7.77 0 1.45 1.23 0 89.54 10/1/2017 0:50:01 all 7.08 0 1.5 1.41 0 90.02 10/1/2017 1:00:01 all 6.46 0 1.43 1.82 0 90.29 10/1/2017 1:10:01 all 45.4 0 4.2 29.27 0 21.13 10/1/2017 1:20:01 all 61.74 0 4.74 31.19 0 2.32 10/1/2017 1:30:01 all 64.17 0 4.72 26.31 0 4.81 10/1/2017 1:40:01 all 47.54 0 4.23 19.44 0 28.79 10/1/2017 1:50:01 all 44.59 0 3.68 17.47 0 34.27 10/1/2017 2:00:01 all 49.16 0 4.22 13.47 0 33.15 10/1/2017 2:10:01 all 41.98 0 3.95 16.47 0 37.59'; preg_match_all($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