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 single character of: a, b, c or d
    [[ab][cd]]
  • 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]
  • Character class intersection
    [\w&&[^\d]]
  • 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

Substitution

Processing...

Code Generator

Language

Generated Code

use strict; my $str = 'https://sales.dell.com/customer/details/id/11~82373834 https://www.dell.com/salesapp/quote/internal/us/en/3000127988306/1%3fsccmessageid%3d76e45b07-61a9-4e1a-b3d4-086736cc7b1b&skipquotevalidation%3dfalse https://sales.dell.com/products/configure/line/g0bggab-0kg13lz1eqb33g https://sales.dell.com/customer/details/customernumber/147973836?companynumber=20&shippingid=wd9sv2jmwk27e2wxkgyy2q&installat=true&buid=11 https://sales.dell.com/salesapp/checkout/internal/us/en/compliance-notification/fwta3fm6xu6ua6qys5xozq?sccmessageid=98ab9dab-2877-4ead-9ea9-1746a664c778 https://sales.dell.com/salesapp/order/ca/en/2009403933624?bu=707 https://sales.dell.com/customer/details/customernumber/530028073281?companynumber=18&shippingid=xshqt90gbuwhqtr-lfxtxa&shipto=true '; my $regex = qr/((?<==)([%]?\w+[-@.]?)+)|([\w]+[-%~&]*[\d]+[\w]+/?[-%~&]?)+/mp; my $subst = '*'; my $result = $str =~ s/$regex/$subst/rg; print "The result of the substitution is' $result\n";

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