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 = '<div dir="ltr"><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr"><br></div><u></u> <div> <center id="m_-2051398760120817894wrapper"> <table id="m_-2051398760120817894main" width="100%"> <tbody><tr id="m_-2051398760120817894logo"> <td> <table width="100%"> <tbody><tr> <td> <img src="test.com/logo.png" width="140px" alt="xxxxx Logo" style="padding:0 10px"> </td> </tr> </tbody></table> </td> </tr> <tr> <td height="18px"></td> </tr> <tr id="m_-2051398760120817894header"> <td> <table width="100%"> <tbody><tr> <td height="64px" style="background-color:#10069f;color:#fff;padding-left:24px;font-weight:700">Reset your password</td> </tr> </tbody></table> </td> </tr> <tr id="m_-2051398760120817894content"> <td> <table width="100%"> <tbody><tr> <td style="background-color:#f6f5ff;padding:24px 24px 16px 24px"> <p style="margin-top:0">The following is the verification code required to complete your password reset.</p> <p style="margin-bottom:24px">Enter the following verification code on the screen during the registration, and proceed to the next step.</p> <div style="display:block;text-align:center;margin-bottom:8px;background-color:#fff;height:92px;font-weight:600;font-size:36px;line-height:92px">191418</div> <span style="display:block;font-size:12px;color:#5d5d5d">*The verification code is valid only for 24 hours.</span> </td> </tr> </tbody></table> </td> </tr> <tr> <td height="24px"></td> </tr> <tr id="m_-2051398760120817894footer"> <td> <table width="100%"> <tbody><tr> <td style="background-color:#6d7777;padding:16px 24px;font-size:12px;color:#fff"> <table width="100%"> <tbody><tr> <td id="m_-2051398760120817894footer-left"> <span style="display:block">amnimo Inc.</span> <span style="display:block">0-3-30 usaa-fso, xxxxxxxx-shi, Tokyo, 180-8750, Japan</span> <span style="display:block">Phone: +81-422-52-6779</span> <span id="m_-2051398760120817894copyright-mb" style="margin-top:16px">© 2020 <div dir="ltr"><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr"><br></div><u></u> <div> <center id="m_-2051398760120817894wrapper"> <table id="m_-2051398760120817894main" width="100%"> <tbody><tr id="m_-2051398760120817894logo"> <td> <table width="100%"> <tbody><tr> <td> <img src="https://test.com/logo.png" width="140px" alt="Amnimo Logo" style="padding:0 10px"> </td> </tr> </tbody></table> </td> </tr> <tr> <td height="18px"></td> </tr> <tr id="m_-2051398760120817894header"> <td> <table width="100%"> <tbody><tr> <td height="64px" style="background-color:#10069f;color:#fff;padding-left:24px;font-weight:700">Reset your password</td> </tr> </tbody></table> </td> </tr> <tr id="m_-2051398760120817894content"> <td> <table width="100%"> <tbody><tr> <td style="background-color:#f6f5ff;padding:24px 24px 16px 24px"> <p style="margin-top:0">The following is the verification code required to complete your password reset.</p> <p style="margin-bottom:24px">Enter the following verification code on the screen during the registration, and proceed to the next step.</p> <div style="display:block;text-align:center;margin-bottom:8px;background-color:#fff;height:92px;font-weight:600;font-size:36px;line-height:92px">191418</div> <span style="display:block;font-size:12px;color:#5d5d5d">*The verification code is valid only for 24 hours.</span> </td> </tr> </tbody></table> </td> </tr> <tr> <td height="24px"></td> </tr> <tr id="m_-2051398760120817894footer"> <td> <table width="100%"> <tbody><tr> <td style="background-color:#6d7777;padding:16px 24px;font-size:12px;color:#fff"> <table width="100%"> <tbody><tr> <td id="m_-2051398760120817894footer-left"> <span style="display:block">test Inc.</span> <span style="display:block">2-9-32 ssdsa-sss, puakano-shi, Tokyo, 000-8000, Japan</span> <span style="display:block">Phone: +81-000-00-652</span> <span id="m_-2051398760120817894copyright-mb" style="margin-top:16px">© 2020 amnimo Inc.</span> </td> <td id="m_-2051398760120817894footer-right"> <span style="display:block">© 2020 amnimo Inc.</span> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </center> </div> </div></div> Inc.</span> </td> <td id="m_-2051398760120817894footer-right"> <span style="display:block">© 2020 test Inc.</span> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </center> </div> </div></div>'; my $regex = qr/\b([0-9]{6})\b/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