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

/
/
gmi

Test String

Substitution

Processing...

Code Generator

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "\\s(L.?T.?D.?A.?|E.?I.?R.?L.?|S.?P.?A.?)|(LI?MI?T[DA]{0,3})|(S[\\.\\s]{0,2}?A\\.?)$"; final String string = "CONSTRUCTORA CORACEROS LIMITADA\n" + "SERVICIOS EXTERNOS SARE LTDA\n" + "SOCIEDAD COMERCIAL DE REPRESENTACIONES LIMITADA\n" + "NGS S.A.\n" + "INTERNATIONAL SERVICE LIMITADA\n" + "DARTEL TALCA LIMITADA\n" + "EUROMERCAD S A\n" + "CARGO ENTREGA S A\n" + "DE LA FUENTE Y CARPANETTI LIMITADA\n" + "INGELAN CONSULTORES LIMITADA\n" + "CIA INMOBILIARIA Y DE INVERSIONES TRICELTA LIMITADA\n" + "CHILENA DE COMPUTACION LIMITADA\n" + "ASESORIAS E INVERSIONES RPV LIMITADA\n" + "SOC AGRICOLA Y GANADERA EL MEMBRILLAR LIMITADA\n" + "R Y C CARGO LTDA\n" + "TEJIDOS TRENZATEX LIMITADA\n" + "GENIAL DISENO Y PUBLICIDAD LIMITADA\n" + "ACME ANALYTICAL LABORATORIES S A\n" + "SOC DE TRANSPORTES VALIJA Y CARGAS SERVIVAL LIMITADA\n" + "COMERCIAL E INDUSTRIAL SAN ANGEL LIMITAD\n" + "ARKADIA MUEBLES Y DECORACIONES LTDA\n" + "IMPORTADORA EXPORTADORA YARDAS LIMITADA\n" + "REPDEVAL EQUIPOS Y COMPANIA LIMITADA\n" + "AGENCIA DE ADUANAS JORGE E. CELIS CORNEJO CIA LTDA\n" + "PINTO GLAVICH INGENIERIA Y CONSTRUCCION S A\n" + "PRODUCTOS MITRE LIMITADA\n" + "IMPORTADORA Y COMERCIAL ALTEA LTDA\n" + "COMERCIAL ICOM SPA\n" + "VINA CASABLANCA S.A.\n" + "LATCAM PAGOS INTERNACIONALES S.A.\n" + "SERVICIOS DE MARKETING DIRECTO Y MERCHANDISING LIMITADA\n" + "MONTAJES OROPESA LIMITADA\n" + "AMENABAR Y ASOCIADOS TALLERES GRAFICOS S.A.\n" + "SOCIEDAD SPORT TRADE LIMITADA\n" + "VINA PIRAZZOLI LIMITADA\n" + "OPTICA NUEVA VISION LIMITADA\n" + "B & S SOLUCIONES COMPUTACIONALES LIMITADA\n" + "SOC COMERCIAL PROLABI LIMITADA\n" + "CENTRO DE COMUNICACIONES COPIAPO LIMITADA\n" + "TECNOAYSEN LTDA\n" + "COMERCIO INTERNAC REPRESENT E INV SECTRADE LIMITADA\n" + "SOC GASTRONOMICA CASABLANCA LIMITADA\n" + "SOC COMERC TRADE MARK LIMITADA\n" + "SOC COMERCIAL E INMOBILIARIA PLASTOCK LIMITADA\n" + "SOC PUBLICITARIA MORENO Y COMPANIA LIMITADA\n" + "N PRODUCCIONES LIMITADA\n" + "TECNOLOGIA Y SERVICIOS EN COMPRESORES LIMITADA\n" + "PRODUCTOS Y SERVICIOS COMPUTACIONALES LIMITADA\n" + "AERO ANDINA S A\n" + "COMERCIALIZADORA BANDELSUR LIMITADA\n" + "GLOVOX PRODUCCIONES LIMITADA\n" + "COMERCIAL LORENA GONZALEZ RAMOS E.I.R.L.\n" + "HOSPITAL & DIAGNOSTICS SUPPLIES LIMITADA\n" + "APOYO EXPRESS SERVICIOS LIMITADA\n" + "AGRICOLA LAS MERCEDES DEL LIMARI LIMITADA\n" + "ALIMENTOS DEL NORTE LIMITADA\n" + "IKONS ATN INVERSIONES LIMITADA\n" + "JULIO Y NIXON LIMITADA\n" + "SOC AGRICOLA Y COMERCIAL JERUSALEM LIMITADA\n" + "IMAGEN Y DISENO LIMITADA\n" + "XPERIENCE CONSULTORIA Y SERVICIOS COMPUTACIONALES LIMTADA\n" + "SERVICIOS PUBLICITARIOS CANAL DIRECTO LIMITADA"; final String subst = ""; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE | Pattern.CASE_INSENSITIVE); final Matcher matcher = pattern.matcher(string); // The substituted value will be contained in the result variable final String result = matcher.replaceAll(subst); System.out.println("Substitution result: " + result); } }

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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html