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

/
/
gm

Test String

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 = "(<(?:(?:(?:(script|style|object|embed|applet|noframes|noscript|noembed)(?:\\s+(?=((?:\"[\\S\\s]*?\"|'[\\S\\s]*?'|(?:(?!\\/>)[^>])?)+))\\3)?\\s*>)[\\S\\s]*?<\\/\\2\\s*(?=>))|(?:\\/?[\\w:]+\\s*\\/?)|(?:[\\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]*?))))>)|([^<>]*?)(querry)"; final String string = "<body class=\"mediawiki querry ltr sitedir-ltr ns-0 ns-subject page-International_English_Language_Testing_System skin-vector action-view vector-animateLayout\">\n" + " <div id=\"mw-page-base\" class=\"noprint\"></div>\n" + " <div id=\"mw-head-base\" class=\"noprint\"></div>\n" + " <div id=\"content\" class=\"mw-body\" role=\"main\">\n" + " <a id=\"top\"></a>\n\n" + "and also a normal querry\n\n" + " <div id=\"siteNotice\"><!-- CentralNotice --></div>\n" + " <h1 id=\"firstHeading\" class=\"firstHeading\" lang=\"en\"><span dir=\"auto\">International English Language Testing System</span></h1>\n" + " <div id=\"bodyContent\" class=\"mw-body-content\">\n" + " <div id=\"siteSub\">From Wikipedia, the free encyclopedia</div>\n" + " <div id=\"contentSub\">  (Redirected from <a href=\"/w/index.php?title=IELTS&amp;redirect=no\" title=\"IELTS\">IELTS</a>)</div>\n" + " <div id=\"jump-to-nav\" class=\"mw-jump\">\n" + " Jump to: <a href=\"#mw-navigation\">navigation</a>, <a href=\"#p-search\">search</a>\n" + " </div>\n" + " <div id=\"mw-content-text\" lang=\"en\" dir=\"ltr\" class=\"mw-content-ltr\"><table class=\"infobox vevent\" cellspacing=\"3\" style=\"border-spacing:3px;width:22em;\">\n" + "<caption class=\"summary\">International English Language Testing System</caption>\n" + "<tr>\n" + "<td colspan=\"2\" style=\"text-align:center;\"><a href=\"/wiki/File:IELTS_logo.svg\" class=\"image\"><img alt=\"IELTS logo.svg\" src=\"//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/IELTS_logo.svg/300px-IELTS_logo.svg.png\" width=\"300\" height=\"113\" srcset=\"//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/IELTS_logo.svg/450px-IELTS_logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7f/IELTS_logo.svg/600px-IELTS_logo.svg.png 2x\" data-file-width=\"778\" data-file-height=\"293\" /></a></td>\n" + "</tr>\n" + "<tr>\n" + "<th scope=\"row\" style=\"text-align:left;\">Acronym</th>\n" + "<td>IELTS</td>\n" + "</tr>\n" + "<tr>\n" + "<th scope=\"row\" style=\"text-align:left;\">Type</th>\n" + "<td>Standardized test. Available in 2 versions: \"Academic\" and \"General training\".</td>\n" + "</tr>\n" + "<tr>\n" + "<th scope=\"row\" style=\"text-align:left;\">Developer / administrator</th>\n" + "<td><a href=\"/wiki/Cambridge_English_Language_Assessment\" title=\"Cambridge English Language Assessment\">Cambridge English Language Assessment</a>, <a href=\"/wiki/British_Council\" title=\"British Council\">British Council</a>, <a href=\"/wiki/IDP_Education\" title=\"IDP Education\">IDP Education</a>.</td>\n" + "</tr>\n" + "<tr>\n" + "<th scope=\"row\" style=\"text-align:left;\">Knowledge/skill(s) tested</th>\n" + "<td>Listening, reading, writing and speaking of the <a href=\"/wiki/English_language\" title=\"English language\">English language</a>.</td>\n" + "</tr>\n" + "<tr>\n" + "<th scope=\"row\" style=\"text-align:left;\">Purpose</th>\n" + "<td>To assess the English language proficiency of non-native English speakers.</td>\n" + "</tr>\n"; 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