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 = 'El\\r\\n_I ERNST&YOUNC Expense Report\\r\\nI Date Prepared: 01-08-2019 I Managing Country: XE I\\r\\nI Submitted: 01-08-2019 (In Audit) | Business Unit: XE045 I\\r\\n| GPN - Name: XE021000618 — Paul Prashanth | Management Unit: 00801 Sub Management Unit: 0907302 |\\r\\nI Signature: I Approved By: Rank: I\\r\\nI Rank: Administrative Contractor I Approval Signature: I\\r\\nI Expense Details (Attach supporting receipts) I Total Net IC = Chargeable P = Authorized I\\r\\nI Loc I Expense Type I Date I Description I Expense Expense I Type I Engagement I Activity I\\r\\nOTHER International Travel-Non-Billable - Ground 01-08-2019 Need clarification for claiming the taxi expenses P 33800872 0000\\r\\nTransportation - Mass/Public Transportation from same vendor for INR 2400 & No receipts fo\\r\\nTelephone for GBP l (INR 97.89) & Taxi for GB\\r\\n25 (INR 2470.75) Barcode : 2170270878\\r\\nI IIIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIII IIII Tom’s I 0.00 I 0.00 I Tom] KilometreSI I\\r\\n* 2 1 7 1 9 5 9 5 2 8 it Report Date Format: dd-mm-yyyy\\r\\nPage 1 of 1 10-06-2020'; my $regex = qr/(?<=KilometreSI I\\r\\n\*).[0-9\s]+/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