Regular Expressions 101

Save & Manage Regex

  • Current Version: 3
  • 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
There are currently no sponsors. Become a sponsor today!
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"(\$INGGA.*\n\$INHDT.*\n)") test_str = ("$INGGA,091124.00,5249.8336,N,00120.9619,W,1,20,0.6,95.0,M,49.4,M,,*50\n" "$INHDT,31.9,T*1E $INZDA,091124.0055,06,05,2016,,*7F\n" "$INVTG,22.0,T,,M,4.4,N,8.1,K,A*24 \n" "$PRDID,2.13,-0.06,34.09*6C\n" "$INGGA,091124.20,5249.8338,N,00120.9618,W,1,20,0.6,95.0,M,49.4,M,,*5D\n" "$INHDT,34.1,T*13 $INZDA,091124.2055,06,05,2016,,*7D\n" "$INVTG,24.9,T,,M,4.4,N,8.1,K,A*2B \n" "$PRDID,2.16,-0.03,36.24*61\n" "$INGGA,091124.40,5249.8340,N,00120.9616,W,1,20,0.6,95.0,M,49.4,M,,*5A\n" "$INHDT,36.3,T*13 $INZDA,091124.4055,06,05,2016,,*7B\n" "$INVTG,27.3,T,,M,4.4,N,8.1,K,A*22 \n" "$PRDID,2.11,-0.05,38.33*68\n" "$INGGA,091124.60,5249.8343,N,00120.9614,W,1,20,0.6,95.1,M,49.4,M,,*58\n" "$INHDT,38.4,T*1A $INZDA,091124.6055,06,05,2016,,*79\n" "$INVTG,29.5,T,,M,4.4,N,8.1,K,A*2A \n" "$PRDID,2.09,-0.02,40.37*6D\n" "$INGGA,091124.80,5249.8345,N,00120.9612,W,1,20,0.6,95.1,M,49.4,M,,*56\n" "$INHDT,40.4,T*15 $INZDA,091124.8055,06,05,2016,,*77\n" "$INVTG,31.7,T,,M,4.4,N,8.1,K,A*21 \n" "$PRDID,2.09,0.02,42.42*40\n" "$INGGA,091125.00,5249.8347,N,00120.9610,W,1,20,0.6,95.1,M,49.4,M,,*5F\n" "$INHDT,42.4,T*17\n") 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