Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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"\s+top=\"\d{1,}\".*><b>'.$enDayNames.'\s+\D+<\/b>") test_str = (" top=\"241\" left=\"79\" width=\"105\" height=\"7\" font=\"3\">InnerSpace - InnerSpace: Top </text>\n" " top=\"250\" left=\"79\" width=\"97\" height=\"7\" font=\"3\">25 Sexy Sci-Fi Stars 2015 (0)</text>\n" " top=\"259\" left=\"79\" width=\"27\" height=\"7\" font=\"3\">HD CC[]</text>\n" " top=\"268\" left=\"79\" width=\"27\" height=\"7\" font=\"3\">EXEMPT</text>\n" " top=\"286\" left=\"79\" width=\"95\" height=\"10\" font=\"4\">InnerSpace - - (208)</text>\n" " top=\"299\" left=\"79\" width=\"38\" height=\"10\" font=\"4\">HD CC[]</text>\n" " top=\"311\" left=\"79\" width=\"38\" height=\"10\" font=\"4\">EXEMPT</text>\n" " top=\"331\" left=\"80\" width=\"85\" height=\"12\" font=\"2\">Being Human - </text>\n" " top=\"345\" left=\"80\" width=\"85\" height=\"12\" font=\"2\">Cheater of The </text>\n" " top=\"359\" left=\"80\" width=\"44\" height=\"12\" font=\"2\">Pack (6)</text>\n" " top=\"374\" left=\"80\" width=\"63\" height=\"12\" font=\"2\">HD CC DV[]</text>\n" " top=\"388\" left=\"80\" width=\"22\" height=\"12\" font=\"2\">14+</text>\n" " top=\"419\" left=\"80\" width=\"107\" height=\"12\" font=\"2\">Star Trek: Voyager </text>\n" " top=\"434\" left=\"80\" width=\"103\" height=\"12\" font=\"2\">- Flesh And Blood, </text>\n" "<text top=\"90\" left=\"386\" width=\"166\" height=\"11\" font=\"1\"><b>03-AUG-2015 to 09-AUG-2015</b></text>\n" "<text top=\"152\" left=\"37\" width=\"31\" height=\"11\" font=\"1\"><b>06:00</b></text>\n" "<text top=\"240\" left=\"37\" width=\"31\" height=\"11\" font=\"1\"><b>07:00</b></text>\n" "<text top=\"329\" left=\"37\" width=\"31\" height=\"11\" font=\"1\"><b>08:00</b></text>\n" "<text top=\"115\" left=\"108\" width=\"63\" height=\"13\" font=\"0\"><b>Monday </b></text>\n" "<text top=\"131\" left=\"111\" width=\"45\" height=\"13\" font=\"0\"><b>Aug 03</b></text>\n" "<text top=\"76\" left=\"449\" width=\"41\" height=\"11\" font=\"1\"><b>SPACE</b></text>\n" "<text top=\"117\" left=\"324\" width=\"67\" height=\"11\" font=\"1\"><b>Wednesday</b></text>\n" "<text top=\"131\" left=\"337\" width=\"40\" height=\"11\" font=\"1\"><b>Aug 05</b></text>\n" "<text top=\"115\" left=\"439\" width=\"65\" height=\"13\" font=\"0\"><b>Thursday </b></text>\n" "<text top=\"131\" left=\"447\" width=\"45\" height=\"13\" font=\"0\"><b>Aug 06</b></text>\n" "<text top=\"115\" left=\"561\" width=\"52\" height=\"13\" font=\"0\"><b>Friday </b></text>\n" "<text top=\"131\" left=\"558\" width=\"45\" height=\"13\" font=\"0\"><b>Aug 07</b></text>\n" "<text top=\"115\" left=\"664\" width=\"62\" height=\"13\" font=\"0\"><b>Saturday </b></text>\n" "<text top=\"131\" left=\"670\" width=\"45\" height=\"13\" font=\"0\"><b>Aug 08</b></text>\n" "<text top=\"115\" left=\"780\" width=\"60\" height=\"13\" font=\"0\"><b>Sunday </b></text>\n" "<text top=\"131\" left=\"782\" width=\"45\" height=\"13\" font=\"0\"><b>Aug 09</b></text>") 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