Regular Expressions 101

Save & Manage Regex

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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 single character of: a, b, c or d
    [[ab][cd]]
  • 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]
  • Character class intersection
    [\w&&[^\d]]
  • 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 java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "^([a-zA-ZáéíóúàèìòùÁÉÍÓÚÀÈÌÒÙ]+ )*+[a-zA-ZáéíóúàèìòùÁÉÍÓÚÀÈÌÒÙ]+$"; final String string = "Aarón Ander\n" + "Abel Andrés Joel\n" + "Abelardo Ángel Jon\n" + "Abraham Aníbal Jordi\n" + "Adalberto Antonio Jorge\n" + "Adam Arnau José\n" + "Adán Arturo Jose Antonio\n" + "Adiran Asier Jose Luis\n" + "Adolfo Augusto Jose Manuel\n" + "Adrià Aurelio Jose Maria\n" + "Adrián Baltasar Juan\n" + "Agustín Bartolomé Blas\n" + "Aimar Basilio Juan Antonio\n" + "Aitor Benito Boris\n" + "Alano Benjamín Juan Carlos\n" + "Alberto Bernardo Borja\n" + "Aldo Bienvenido Brahim\n" + "Aleix Blas Brais\n" + "Alejandro Boris Bruno\n" + "Alejo Borja Calisto\n" + "Alex Brahim Juan José\n" + "Alfonso Brais Camilo\n" + "Alfredo Bruno Juan Manuel\n" + "Alonso Calisto Carlos\n" + "Álvaro Camilo Julio\n" + "Amadeo Carlos Cayetano\n" + "Amado Cayetano César\n" + "Amando César Christian\n" + "Ambrosio Christian Claudio\n" + "Amin Claudio Clemente\n" + "Anastasio Clemente Conrado\n" + "Ander Conrado Constantino\n" + "Constantino Francisco Javier Joel\n" + "Crispín Francisco José Jon\n" + "Cristian Gabriel Jordi\n" + "Daniel Gaspar Jorge\n" + "Darío Gerard José\n" + "David Gerardo Jose Antonio\n" + "Desiderio Germán Jose Luis\n" + "Diego Gonzalo Jose Manuel\n" + "Dionisio Gregorio Jose Maria\n" + "Domingo Guillem Juan\n" + "Donato Guillermo Juan Antonio\n" + "Edgar Gustavo Juan Carlos\n" + "Edmundo Hamza Juan José\n" + "Eduardo Héctor Juan Manuel\n" + "Elías Honorato Julio\n" + "Eloy Hugo Justino\n" + "Emilio Humberto Justo\n" + "Eneko Ibai Kevin\n" + "Enrique Ibrahim Kilian\n" + "Eric Ignacio Leo\n" + "Ernesto Iker Leopoldo\n" + "Esteban Isidoro Lorenzo\n" + "Eugenio Ismael Louis\n" + "Eusebio Ivo Lucas\n" + "Fabián Izan Luciano\n" + "Federico Jaime Luis\n" + "Felipe Jan Macario\n" + "Félix Jaume Manuel\n" + "Fermín Javier Marc\n" + "Fernando Jesús Marcelo\n" + "Fidel Joan Marco\n" + "Francisco Joaquín Marcos\n" + "Marcos Pau Tomás\n" + "Mariano Pedro Ulises\n" + "Mario Pelayo Unai\n" + "Marti Plácido Urbano\n" + "Martín Platón Valentín\n" + "Mateo Pol Vicente\n" + "Matías Ponce Víctor\n" + "Mauricio Quintín Virgilio\n" + "Maximiliano Rafael Walter\n" + "Máximo Ramiro Wen\n" + "Miguel Ramón Xabier\n" + "Miguel Ángel Raúl Xavier\n" + "Mikel Ricardo Ximen\n" + "Mohamed Roberto Yerai\n" + "Moisés Rodrigo Yeray\n" + "Nabil Rogelio Yunes\n" + "Narciso Román Yusef\n" + "Nathan Rubén Zacarías\n" + "Nicolás Salvador Zenon\n" + "Noé Samuel Zoilo\n" + "Octavio Santiago\n" + "Oier Sebastián\n" + "Omar Sergi\n" + "Oriol Sergio\n" + "Óscar Silvestre\n" + "Pablo Simón\n" + "Pancho Teodoro"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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