Regular Expressions 101

Save & Share

  • Regex Version: ver. 20
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

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

/
/
gmu

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|[ ]{2}|[!$%^&*()_+|~=`\{\}\[\]:\";<>?,\/]))(?:(?:e|da|do|das|dos|de|d'|D'|la|las|el|los|l')\s*?|(?:[A-ZàáâäãåąčćęèéêëėįìíîïłńòóôöõøùúûüųūÿýżźñçčšžÀÁÂÄÃÅĄĆČĖĘÈÉÊËÌÍÎÏĮŁŃÒÓÔÖÕØÙÚÛÜŲŪŸÝŻŹÑßÇŒÆČŠŽ∂ð'][^\s]*\s*?)(?!.*[ ]$))+$" test_str = ("Maria Silva\n" "Maria silva\n" "maria Silva\n" "MariaSilva\n" " Maria Silva\n" "Maria Silva \n" "Maria da Silva\n" "Marina Silva\n" "Maria / Silva\n" "Maria . Silva\n" "Maria Silva\n" "Maria G. Silva\n" "Maria McDuffy\n" "Getúlio Dornelles Vargas\n" "Maria das Flores\n" "John Smith\n" "John D'Largy\n" "John Doe-Smith\n" "John Doe Smith\n" "Hector Sausage-Hausen\n" "Mathias d'Arras\n" "Martin Luther King Jr.\n" "Ai Wong\n" "Chao Chang\n" "Alzbeta Bara\n" "Marcos Assunção\n" "Maria da Silva e Silva\n" "Juscelino Kubitschek de Oliveira\n" "Natalia maria\n" "Natalia aria\n" "Natalia orea\n" "Maria dornelas\n" "Samuel eto'\n" "Maria da Costa e Silva\n" "Samuel Eto'o\n" "María Antonieta de las Nieves\n" "Eugène\n" "Antòny de Homé April\n" "àntony de Home ùpril\n" "Antony de Home Aprìl\n" "Antony1 de Home Ap*ril\n" "Ap*ril Willians\n" "Antony_ de Home Apr+il\n" "Ant_ony de Home Apr#il\n" "Antony@ de Ho@me Apr^il\n" "Pierre de l'Estache\n" "Pierre de L'Estoile\n" "Akihito\n") matches = re.finditer(regex, test_str, re.MULTILINE | re.UNICODE) 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