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
Processing...

Test String

Code Generator

Language

Generated Code

import re regex = re.compile(r"([0-9]*)(?=<\/option>)") test_str = ("<select name=\"ctl00$ContentPlaceHolder1$ddlyear\" onchange=\"javascript:setTimeout('__doPostBack(\\'ctl00$ContentPlaceHolder1$ddlyear\\',\\'\\')', 0)\" id=\"ctl00_ContentPlaceHolder1_ddlyear\" class=\"page-heading\" style=\"background-color: rgb(255, 244, 244); width: 95px; outline: 1px solid blue;\"> <option selected=\"selected\" value=\"Select Year\">Select Year</option> <option value=\"2000\">2000</option> \n" "<option value=\"2001\">2001</option> \n" "<option value=\"2002\">2002</option> \n" "<option value=\"2003\">2003</option> \n" "<option value=\"2004\">2004</option>\n" "<option value=\"2005\">2005</option> \n" "<option value=\"2006\">2006</option> \n" "<option value=\"2007\">2007</option> \n" "<option value=\"2008\">2008</option> \n" "<option value=\"2009\">2009</option> \n" "<option value=\"2010\">2010</option> \n" "<option value=\"2011\">2011</option> \n" "<option value=\"2012\">2012</option> \n" "<option value=\"2013\">2013</option> \n" "<option value=\"2014\">2014</option> \n" "<option value=\"2015\">2015</option> \n" "<option value=\"2016\">2016</option> \n" "<option value=\"2017\">2017</option> \n" "</select>") matches = regex.finditer(test_str) for match_num, match in enumerate(matches, start=1): print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}") for group_num, group in enumerate(match.groups(), start=1): print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")

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 Python, please visit: https://docs.python.org/3/library/re.html