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

r"
"
gm

Test String

Code Generator

Language

Generated Code

use strict; my $str = '---- Airport SPQU :S16:20:25.6431 W071:34:22.3800 8338ft Country Name="Peru" State Name="" City Name="Arequipa" Airport Name="Rodriguez Ballon" in file: ORBX\\FTX_VECTOR\\FTX_VECTOR_AEC\\scenery\\AEC_SPQU.bgl ---- Airport SPRF :S14:15:59.9484 W070:27:59.9997 14419ft Country Name="Peru" State Name="" City Name="San Rafael" Airport Name="San Rafael" in file: Scenery\\0304\\scenery\\APX29370.bgl Start 12 : S14:15:40.9653 W070:28:38.3900 14419ft Hdg: 117.0T, Length 8760ft Start 30 : S14:16:18.9314 W070:27:21.6092 14419ft Hdg: 297.0T, Length 8760ft 0120 Lat -14.261198 Long -70.477715 Alt 14419 Hdg 120 Len 8760 Wid 98 0300 Lat -14.272106 Long -70.455620 Alt 14419 Hdg 300 Len 8760 Wid 98 ---- Airport TNCB :N12:08:25.5567 W068:16:34.3503 20ft Country Name="Netherlands Antilles" State Name="" City Name="Bonaire I" Airport Name="Flamingo" in file: Scenery\\0303\\scenery\\APX29270.bgl Start 10 : N12:08:23.2891 W068:17:16.0525 20ft Hdg: 92.0T, Length 9448ft Start 28 : N12:08:20.1144 W068:15:43.9767 20ft Hdg: 272.0T, Length 9448ft 0100 Lat 12.139818 Long -68.288246 Alt 20 Hdg 100 Len 9448 Wid 148 0280 Lat 12.138905 Long -68.261757 Alt 20 Hdg 280 Len 9448 Wid 148 ---- Airport TNCC :N12:11:20.0649 W068:57:34.8897 29ft Country Name="Netherlands Antilles" State Name="" City Name="Curacao I" Airport Name="Willemstad-Hato Intl." in file: Scenery\\0303\\scenery\\APX29270.bgl Start 11 : N12:11:30.5607 W068:58:24.9607 29ft Hdg: 102.1T, Length 11186ft Start 29 : N12:11:08.2410 W068:56:38.2654 29ft Hdg: 282.1T, Length 11186ft 0110 Lat 12.191923 Long -68.974129 Alt 29 Hdg 111 Len 11186 Wid 197 ILS 111.90, Flags: GS DME BC 0290 Lat 12.185513 Long -68.943428 Alt 29 Hdg 291 Len 11186 Wid 197 ---- Airport TNCE :N17:29:32.4738 W062:58:29.8992 129ft Country Name="Netherlands Antilles" State Name="" City Name="St Eustatius I" Airport Name="F.D. Roosevelt" in file: ORBX\\FTX_OLC\\FTX_VECTOR_FixedAPT\\scenery\\APT_TNCE.BGL Start 6 : N17:29:35.1949 W062:59:02.6666 129ft Hdg: 50.3T, Length 4268ft Start 24 : N17:30:00.9808 W062:58:30.1439 129ft Hdg: 230.2T, Length 4268ft 0060 Lat 17.492956 Long -62.984272 Alt 129 Hdg 63 Len 4268 Wid 98 0240 Lat 17.500425 Long -62.974819 Alt 129 Hdg 243 Len 4268 Wid 98 ---- Airport TNCM :N18:02:27.0378 W063:06:34.2595 13ft Country Name="Netherlands Antilles" State Name="" City Name="St Maarten I" Airport Name="Princess Juliana Intl" in file: Scenery\\0303\\scenery\\APX31250.bgl Start 9 : N18:02:21.9843 W063:07:08.8215 13ft Hdg: 81.7T, Length 7150ft Start 27 : N18:02:31.8322 W063:05:57.8823 13ft Hdg: 261.7T, Length 7150ft 0090 Lat 18.039392 Long -63.119469 Alt 13 Hdg 95 Len 7150 Wid 148 0270 Lat 18.042223 Long -63.099060 Alt 13 Hdg 275 Len 7150 Wid 148 ----'; my $regex = qr/^----\n(Airport\s+TNCB.*(?:\n.*)*?)\n----/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