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

/
/
gx

Test String

Code Generator

Language

Generated Code

$re = '/(,\s*(*SKIP))?+ # Attempts to match a comma and advanced whitespaces, # without backtracking; # And if the comma is matched, use (*SKIP) verb, # which advances the pointer if we fail to match the comma. # Key - Value pairs not worthy of keeping. ( "(?!jobID"|exec)[^"]+" # Check if we like this key. \s*+:\s*+ # The colon, advance whitespaces. ( # Check keys recursively. "[^"]*" # String literals, boring. | {(?2)?+(?>,\s*(?2))*} # Or: An object storing some key-value pairs # we don\'t care about. | \[(?3)?+(?>,\s*(?3))*\] # Or: An array storing some values # we don\'t care about. ) ) (?(1)|,?) # Balance the comma (so the result string is still valid JSON)/x'; $str = ' "2597401":[{"jobID":"2597401", "account":"TG-CCR120014", "user":"charngda", "pkgT":{"pgi/7.2- 5":{"libA":["libpgc.so"], "flavor":["default"]}}, "startEpoch":"1338497979", "runTime":"1022", "execType":"user:binary", "exec":"ft.D.64", "numNodes":"4", "sha1":"5a79879235aa31b6a46e73b43879428e2a175db5", "execEpoch":1336766742, "execModify":"Fri May 11 15:05:42 2012", "startTime":"Thu May 31 15:59:39 2012", "numCores":"64", "sizeT":{"bss":"1881400168","text":"239574","data":"22504"}}, {"jobID":"2597401", "account":"TG-CCR120014", "user":"charngda", "pkgT":{"pgi/7.2-5":{"libA":["libpgc.so"], "flavor":["default"]}}, "startEpoch":"1338497946", "runTime":"33" "execType":"user:binary", "exec":"cg.C.64", "numNodes":"4", "sha1":"caf415e011e28b7e4e5b050fb61cbf71a62a9789", "execEpoch":1336766735, "execModify":"Fri May 11 15:05:35 2012", "startTime":"Thu May 31 15:59:06 2012", "numCores":"64", "sizeT":{"bss":"29630984","text":"225749","data":"20360"}}, {"jobID":"2597401", "account":"TG-CCR120014", "user":"charngda", "pkgT":{"pgi/7.2-5": {"libA":["libpgc.so"], "flavor":["default"]}}, "startEpoch":"1338500447", "runTime":"145", "execType":"user:binary", "exec":"mg.D.64", "numNodes":"4", "sha1":"173de32e1514ad097b1c051ec49c4eb240f2001f", "execEpoch":1336766756, "execModify":"Fri May 11 15:05:56 2012", "startTime":"Thu May 31 16:40:47 2012", "numCores":"64", "sizeT":{"bss":"456954120","text":"426186","data":"22184"}},{"jobID":"2597401", "account":"TG-CCR120014", "user":"charngda", "pkgT":{"pgi/7.2-5":{"libA":["libpgc.so"], "flavor":["default"]}}, "startEpoch":"1338499002", "runTime":"1444", "execType":"user:binary", "exec":"lu.D.64", "numNodes":"4", "sha1":"c6dc16d25c2f23d2a3321d4feed16ab7e10c2cc1", "execEpoch":1336766748, "execModify":"Fri May 11 15:05:48 2012", "startTime":"Thu May 31 16:16:42 2012", "numCores":"64", "sizeT":{"bss":"199850984","text":"474218","data":"27064"}}],'; preg_match_all($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