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

~
~
igx

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 = "#opening tag\n" + "\\{(RAW|ACCESS|DWNLINK|MODL|\\w+)\n" + " #optional attributes\n" + " (?>\n" + " \\{ ([^\\}]*) \\}\n" + " )?\n\n" + "\\}\n\n\n" + "#optional text and closing tag\n" + "(?:\n" + " ( #text:= any char except \"\\{\", or a \"\\{\" not followed by /commandname\n" + " [^\\{]*+\n" + " (?>\\{(?!/?\\1[\\{\\}])[^\\{]*)*?\n" + " )\n\n" + " #closing tag\n" + " \\{/\\1\\}\n" + ")?"; final String string = "<div class=\"blog-list-item blog\"><header class=\"entry-title\">\n" + " <h1>Welcome to our website</h1>\n" + " </header><article id=\"entry-72\" class=\"entry post-72 page et-bg-layout-dark et-white-bg\"><div class=\"jumbotron row\">\n" + "<div class=\"col-md-8\">\n" + "<ul>\n" + "<li>You have a pending job on your neck?&hellip;</li>\n" + "<li>Do your company need a website makeover ?&hellip;</li>\n" + "<li>Or a competitive web application ? ?&hellip;</li>\n" + "<li>Do you need a customized plugin, or a tweak ?&hellip;</li>\n" + "<li>Maybe you want a personal website ?&hellip;</li>\n" + "<li>Or a graphic for your new project ?&hellip;</li>\n" + "</ul>\n" + "<div class=\"bg-primary well\">\n" + "<h4 class=\"text-center text-white shadow\">Track your project as we work it to perfection...</h4>\n" + "</div>\n" + "</div>\n" + "<div class=\"pull-right col-md-4\">\n" + "<h4 class=\"bg-primary text-white well\">Other services we offer</h4>\n" + "{ACCESS{type=500}}\n" + "<ul>\n" + "<li>SEO work for an existing website or new</li>\n" + "<li>Bulk SMS</li>\n" + "<li>E-currency exchange</li>\n" + "<li>Facebook AD</li>\n" + "<li>Google AD</li>\n" + "</ul>\n" + "{/ACCESS}</div>\n" + "{RAW{say=email,access=500}} {RAW} <a class=\"btn button large tall green\" href=\"client-area\">Place new Job now as we deliver at the quickest <em>reasonable time</em></a>{/RAW}</div></article></div>"; final Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | 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