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

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 = "^((http|https):\\/\\/)?(www.)?(?!.*(http|https|www.))[a-zA-Z0-9_-]+(\\.[a-zA-Z]+)+(\\/)?.([\\w\\?[a-zA-Z-_%\\/@?]+)*([^\\/\\w\\?[a-zA-Z0-9_-]+=\\w+(&[a-zA-Z0-9_]+=\\w+)*)?$"; final String string = "httpsa://localhost/pwa/deals\n" + "https://localhost/pwa/deals\n" + "https://localhost/pwa/deals\n" + "https://localhost/pwa/deals/api/sdsdsd\n" + "fb.com/animesh\n" + "sleeptight.com\n" + "multitasking.com\n" + "a2.com\n" + "asdasdasd.com\n" + "sdsdc\n" + "check abunes.com/\n" + "#.in\n" + "google@http://asd.com\n" + "animes@google.com\n" + "test@test.com\n" + "--2-\n" + "www.com\n" + "http://www.computer.com.au/\n" + "f4.animesh@google.com\n" + "https://animeshsingh.in\n" + "http://animeshsingh.in/\n" + "someone.ag\n" + "someone.br/ads\n" + "www.test-my-skills.gov.cz/0999asd-xzc88?0-_/sad%20123/@asdas\n" + "Http://www.@test.com\n" + "Https://www.@test.com\n" + "https://asa .aasd.com\n" + "test@asda.test.cas\n" + "someone.com\n" + "asdasd.com/asdasd/asdasd/asdasd/@asasd\n" + "ftp://siva:asdas@sadasd/asd\n" + "adc\n" + "2@https://www.go.com\n" + "www.google.com\n" + "https://www.somehow.com/@aasd\n" + "https://www.test.facebook.com/@sdas\n" + "Https://www.test.com/@masdasd\n" + "www.instagram.com/f4animesh\n" + "http://www.animeshsingh.in\n" + "www.ASD.com"; 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