Regular Expressions 101

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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 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

@
@
gmsx

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 = "(?=<div[ ]class=\"aawp\">) # El primer div debe ser con clase aawp\n" + "( # primer grupo (será la base de la recursividad)\n\n" + " #--- Opciones ---#\n" + " # Cualquier cosa salvo <> una o más veces\n" + " [^<>]+\n" + " # Cualquier etiqueta vacía (void element)\n" + " | <(?=area|base|br|col|embed|hr\n" + " |img|input|link|meta|param|source\n" + " |track|wbr)\\w+[^>]*>\n" + " # Comentarios html\n" + " | <!-- .*? -->\n" + " # Cualquier otra etiqueta (puede tener anidación)\n" + " # Recursividad con grupo 1 (?1). El grupo 2 se usa para \n" + " # cerrar la misma etiqueta original\n" + " | <(\\w+)[^>]*>(?1)*</\\2>\n" + ")\n"; final String string = "<div class=\"aawp\">\n" + "<br>\n" + "<div>\n" + " <div>asd</div>\n" + "</div>\n" + "</div>\n\n" + "<div class=\"aawp\">\n" + " <div id=\"aawp-tb-445\">\n" + " <div class=\"aawp-tb aawp-tb--desktop aawp-tb--cols-5 aawp-tb--hide-labe\">\n" + " <a>a</a>\n" + " <br />\n" + " <img src=\"abc\">\n" + " <hr>\n" + " </div>\n" + " <div class=\"aawp-tb aawp-tb--desktop aawp-tb--cols-5 aawp-tb--hide-labe\">\n" + " ...\n" + " </div>\n" + " <div class=\"aawp-tb aawp-tb--desktop aawp-tb--cols-5 aawp-tb--hide-labe\">\n" + " ...\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"aawp\">\n" + " ...\n" + "</div>\n\n" + "<div class=\"aawp\">\n" + " <div id=\"aawp-tb-445\">\n" + " <div class=\"aawp-tb aawp-tb--desktop aawp-tb--cols-5 aawp-tb--hide-labe\">\n" + " ...\n" + " </div>\n" + " </div>\n" + "</div>\n\n\n" + "<div class=\"aawp\">\n" + " <div> x </div>\n" + " <div> x </div>\n" + "</div>\n\n\n"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE | Pattern.DOTALL | Pattern.COMMENTS); 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