Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

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
No Match

/
/
gm

Test String

Code Generator

Language

Generated Code

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"\d{1,9}(eur.*)? honoraires? exclus" test_str = ("----------------------------------------------------------------------------------\n" "[REGEX_1 = hors honoraires?:? (:\\s)?\\d{1,9}]\n" "----------------------------------------------------------------------------------\n" "prix hors honoraires 900 000 €. no\n" "prix hors honoraire 900 000 €. no\n" "prix hors honoraire: 900 000 €. no\n" "prix hors honoraires 168 000 € ttc.\n" "prix hors honoraires 600 000 € ht. \n" "prix hors honoraires 125 000 €. no\n" "prix hors honoraires 2 500 000 € pa\n" "prix hors honoraires 100 000 €. no\n" "prix hors honoraires 250 000 € h\n" "prix hors honoraires: 250 000 € h\n" "prix de vente hors honoraires : 620 000 €\n\n" "----------------------------------------------------------------------------------\n" "[REGEX_2 = \\d{1,9} ([a-zA-Z_\\/€²]{1,12}) hors honoraires?]\n" "----------------------------------------------------------------------------------\n" "1 050 000 € hors honoraires\n" "450 000 euros hors honoraires\n" "287600 eur hors honoraires\n" "450 ht/hc/m²/an hors honoraires\n" "450 € /m2 ht/hc/an hors honoraires\n" "450 m²/an/ ht hc et hors honoraires\n\n" "----------------------------------------------------------------------------------\n" "[REGEX_3 = \\d{1,9}(eur.*)? hors honoraires?]\n" "----------------------------------------------------------------------------------\n" "65 000 hors honoraires \n" "400000eur hors honoraires \n\n" "----------------------------------------------------------------------------------\n" "[REGEX_4 = honoraires? exclus:? (:\\s)?\\d{1,9}]\n" "----------------------------------------------------------------------------------\n" "prix honoraires exclus : 80 000 eur\n" "prix honoraires exclus : 550 000 eur\n" "prix honoraires exclus: 550 000 eur\n\n" "----------------------------------------------------------------------------------\n" "[REGEX_5 = \\d{1,9} ([a-zA-Z_\\/€²]{1,12}) honoraires? exclus]\n" "----------------------------------------------------------------------------------\n" "65 000 eur honoraires exclus\n" "400000 ht/hc/m²/an honoraires exclus\n\n" "----------------------------------------------------------------------------------\n" "[REGEX_6 = \\d{1,9}(eur.*)? honoraires? exclus]\n" "----------------------------------------------------------------------------------\n" "65 000 honoraires exclus\n" "400000eur ht/hc/m²/an honoraires exclus\n" "400000eur honoraires exclus\n\n" "[GOOD ONE]\n" "prix honoraires exclus \n" "honoraires exclus \n" "prix hors honoraires \n" "bail 30/06/22 hors honoraires\n\n") matches = re.finditer(regex, test_str, re.MULTILINE) for matchNum, match in enumerate(matches, start=1): print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group())) for groupNum in range(0, len(match.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum))) # Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

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