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

use strict; my $str = 'Timestamped NMEA: 2021-03-03 23:19:17 $HCHDM,004.90,M*14 2021-03-03 23:19:17 $GPVTG,358.7,T,1.6,M,15.005,N,27.789,K,A*2F 2021-03-03 23:19:17 $HEHDT,001.71,T*18 2021-03-03 23:19:17 $PPLAN,,,,,,,,2*71 2021-03-03 23:19:17 $GPDTM,W84,,00.0000,N,00.0000,E,,W84*41 2021-03-03 23:19:17 $SDDBT,0101.0,f,0030.8,M,016.8,F*02 2021-03-03 23:19:17 $HEHDT,001.70,T*19 2021-03-03 23:19:17 $HCHDM,004.80,M*15 2021-03-03 23:19:17 $PESSA,1.7,1.7,1.7,0.01,P,0.00,S,0.0,S,2000,*2D 2021-03-03 23:19:17 $SDDPT,0030.8,0011.5,40*71 2021-03-03 23:19:17 $HEHDT,001.70,T*19 2021-03-03 23:19:17 $TIROT,-0000.2,A*24 2021-03-03 23:19:17 $PESSD,8.7,D,1.80,N,14.8,N,,,H,L,G,I,C,0A00,2000,0002*08 2021-03-03 23:19:17 $GPGGA,231916.00,2204.6412,N,11437.4255,E,1,10,0.8,34.3,M,-0.5,M,,*44 2021-03-03 23:19:17 $GPDTM,W84,,00.0000,N,00.0000,E,,W84*41 2021-03-03 23:19:17 $PFEC,Alarm,0,0*6F '; my $regex = qr/(([\!|\$])([\w]{1,15}))((?:,)([\w.\-\+]{0,20})){1,20}(?:,){0,1}(?:\*){0,1}([A-F0-9]{2}){0,1}/mp; 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