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

/
/

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 = "(?><(?:(?:(?:(script|style|object|embed|applet|noframes|noscript|noembed)(?:\\s+(?>\"[\\S\\s]*?\"|'[\\S\\s]*?'|(?:(?!\\/>)[^>])?)+)?\\s*>)[\\S\\s]*?<\\/\\1\\s*(?=>))|(?:\\/?(?!body)[\\w:]+\\s*\\/?)|(?:(?!body)[\\w:]+\\s+(?:\"[\\S\\s]*?\"|'[\\S\\s]*?'|[^>]?)+\\s*\\/?)|\\?[\\S\\s]*?\\?|(?:!(?:(?:DOCTYPE[\\S\\s]*?)|(?:\\[CDATA\\[[\\S\\s]*?\\]\\])|(?:--[\\S\\s]*?--)|(?:ATTLIST[\\S\\s]*?)|(?:ENTITY[\\S\\s]*?)|(?:ELEMENT[\\S\\s]*?))))>|[\\S\\s])*?<body(?:\\s+(?>\"[\\S\\s]*?\"|'[\\S\\s]*?'|(?:(?!\\/>)[^>])?)+)?\\s*>((?:<(?:(?:(?:(script|style|object|embed|applet|noframes|noscript|noembed)(?:\\s+(?>\"[\\S\\s]*?\"|'[\\S\\s]*?'|(?:(?!\\/>)[^>])?)+)?\\s*>)[\\S\\s]*?<\\/\\3\\s*(?=>))|(?:\\/?(?!body)[\\w:]+\\s*\\/?)|(?:(?!body)[\\w:]+\\s+(?:\"[\\S\\s]*?\"|'[\\S\\s]*?'|[^>]?)+\\s*\\/?)|\\?[\\S\\s]*?\\?|(?:!(?:(?:DOCTYPE[\\S\\s]*?)|(?:\\[CDATA\\[[\\S\\s]*?\\]\\])|(?:--[\\S\\s]*?--)|(?:ATTLIST[\\S\\s]*?)|(?:ENTITY[\\S\\s]*?)|(?:ELEMENT[\\S\\s]*?))))>|[\\S\\s])*)<\\/body\\s*>"; final String string = "<html>\n" + " <head>\n\n" + " <meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\">\n" + " </head>\n" + " <!-- <body class=\"blah\">original mock body </body> -->\n" + " <body text=\"#000000\" bgcolor=\"#FFFFFF\">\n" + "<!CDATA[Raw unparsed character data can contain </body> with no problems!]]>\n" + "<!-- Comments can also contain </body> -->\n" + "So can JScript\n" + "<script>/*<![CDATA[*/window.jQuery && jQuery.ready();/*]]>*/</script><script>if(window.mw){\n" + "mw.loader.state({\"ext.glo</body>balCssJs.site\":\"ready\",\"ext.globalCssJs.user\":\"ready\",\"site\":\"loading\",\"user\":\"ready\",\"user.groups\":\"ready\"});\n" + "}</script>\n" + " <p>dpioaushd iuashdiu ashd</p>\n" + " <p> has</p>\n" + " <p>ud ashuod sh</p>\n" + " <p>odu sad ha</p>\n" + " <p>suod sh</p>\n" + " <p>od uashod uahd<br>\n" + " </p>\n" + " <div class=\"moz-signature\">-- <br>\n" + " <img src=\"cid:part1.8C289150.C3F89C42@wssim.com.br\" border=\"0\"></div>\n" + " </body>\n" + "</html>"; final Pattern pattern = Pattern.compile(regex); final Matcher matcher = pattern.matcher(string); if (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