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

use strict; my $str = '[ { "MapObject" : { "BoundingBox" : [ -1313.574, -1010.804, -1113.574, -810.804 ], "Caption" : "Ref46", "Comment" : "", "Position" : { "CPosition" : [ -1213.574, -910.804, 0, 0 ] }, "Size" : { "CPosition" : [ 100, 100, 0, 0 ] }, "Type" : "moReferencePointID" } }, { "MapObject" : { "BoundingBox" : [ -1313.06, 495.39, -1113.06, 695.39 ], "Caption" : "Ref47", "Comment" : "", "Position" : { "CPosition" : [ -1213.06, 595.39, 0, 0 ] }, "Size" : { "CPosition" : [ 100, 100, 0, 0 ] }, "Type" : "moReferencePointID" } }, { "MapObject" : { "BoundingBox" : [ -18070, 1180, -17870, 1380 ], "Caption" : "Path way84", "Comment" : "", "ExecutableMapObject" : { "BehaviourList" : [ { "Speed" : 200, "Type" : "bcSpeed" }, { "AvoidanceSpeed" : 150, "FailureAction" : 0, "FailureRetries" : 60, "FailureWait" : 10, "PathMode" : 2, "PerSegment" : 15, "ReturnToStart" : 0, "ScanAngle" : 0.06981317007977778, "Type" : "bcObstacleAvoidance", "Wait" : 10, "WaitUnits" : 2 }, { "BinarySensorStates" : 3, "SensorSensitivityList" : [ { "IgnoreMapData" : false, "Mask" : 65536, "SpeedCapDistance" : 70, "SpeedCapEnabled" : true, "StopDistance" : 70 }, { "IgnoreMapData" : false, "Mask" : 131072, "SpeedCapDistance" : 70, "SpeedCapEnabled" : true, "StopDistance" : 70 }, { "IgnoreMapData" : false, "Mask" : 262144, "SpeedCapDistance" : 240, "SpeedCapEnabled" : true, "StopDistance" : 240 }, { "IgnoreMapData" : false, "Mask" : 524288, "SpeedCapDistance" : 240, "SpeedCapEnabled" : true, "StopDistance" : 240 }, { "IgnoreMapData" : false, "Mask" : 1048576, "SpeedCapDistance" : 240, "SpeedCapEnabled" : true, "StopDistance" : 240 }, { "IgnoreMapData" : false, "Mask" : 2097152, "SpeedCapDistance" : 280, "SpeedCapEnabled" : true, "StopDistance" : 280 }, { "IgnoreMapData" : false, "Mask" : 4194304, "SpeedCapDistance" : 320, "SpeedCapEnabled" : true, "StopDistance" : 320 }, { "IgnoreMapData" : false, "Mask" : 8388608, "SpeedCapDistance" : 0, "SpeedCapEnabled" : false, "StopDistance" : 0 }, { "IgnoreMapData" : false, "Mask" : 16777216, "SpeedCapDistance" : 0, "SpeedCapEnabled" : false, "StopDistance" : 0 } ], "SpeedCap" : 30, "Type" : "bcObstacleSensitivity2" } ], "EntryPoint" : { "CPosition" : [ -13450, 1290, 0, 0 ] }, "ExitPoint" : { "CPosition" : [ -17970, 1280, 0, 0 ] }, "RelocateOnExecute" : false, "Required" : false, "TwoWay" : false }, "GoalSet" : [ { "Path" : { "PathType" : "pitLinear", "Segments" : [ { "Segment" : [ -13450, 1290, -17970, 1280 ] } ] } } ], "Position" : { "CPosition" : [ -17970, 1280, 0, 0 ] }, "Size" : { "CPosition" : [ 0, 0, 0, 0 ] }, "Type" : "moLinePathID" } }, { "MapObject" : { "AttributeList" : [ [ "Lock", "{} LabInt {}" ] ], "BoundingBox" : [ -12350, -500, -12150, -300 ], "Caption" : "QUEUE/LabInt", "Comment" : "", "ExecutableMapObject" : { "EntryPoint" : { "CPosition" : [ -12250, -400, 0, 0 ] }, "ExitPoint" : { "CPosition" : [ -12250, -400, 0, 0 ] }, "RelocateOnExecute" : false, "Required" : false, "TwoWay" : false }, "Position" : { "CPosition" : [ -12250, -400, 0, 0 ] }, "Size" : { "CPosition" : [ 100, 100, 0, 0 ] }, "Type" : "moHotPointID" } }, ]'; my $regex = qr/\{\s*\"MapObject((?!MapObject)[\s\S])+\"Type\"\s*:\s*\"moReference(?:Point|Line)ID\"((?!MapObject)[\s\S])+},?\s*/p; if ( $str =~ /$regex/g ) { print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n"; # print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n"; # print "Capture Group 2 is $2 ... and so on\n"; } # ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p' # Named capture groups can be called via $+{name}

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 Perl, please visit: http://perldoc.perl.org/perlre.html