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

Substitution

Processing...

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 = "^<tr.*?>(?:<td>.*?<\\/td>){2}<td>(.*?)<\\/td><td>.*?<\\/td><td>(.*?)<\\/td>.*?<a href=\".*?_(.*?)_(.*?)\\.html.*$"; final String string = "<tr><td><small>1</small></td><td>Kalisz</td><td>62-800</td><td>Poland</td><td>Greater Poland</td><td>Kalisz</td><td>Kalisz<tr><td></td><td colspan=6>&nbsp;&nbsp;&nbsp;<a href=\"/maps/browse_51.75_18.087.html\" rel=\"nofollow\"><small>51.75/18.087</small></a></td></tr>\n" + "<tr class=\"odd\"><td><small>2</small></td><td>Piotrków Trybunalski</td><td>97-300</td><td>Poland</td><td>Łódź Voivodeship</td><td>Piotrków Trybunalski</td><td>Piotrków Trybunalski<tr class=\"odd\"><td></td><td colspan=6>&nbsp;&nbsp;&nbsp;<a href=\"/maps/browse_51.411_19.689.html\" rel=\"nofollow\"><small>51.411/19.689</small></a></td></tr>\n" + "<tr><td><small>3</small></td><td>Toruń</td><td>87-100</td><td>Poland</td><td>Kujawsko-Pomorskie</td><td>Toruń</td><td>Toruń<tr><td></td><td colspan=6>&nbsp;&nbsp;&nbsp;<a href=\"/maps/browse_53.021_18.623.html\" rel=\"nofollow\"><small>53.021/18.623</small></a></td></tr>"; final String subst = "$2;$1;$3\\/$4"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); // The substituted value will be contained in the result variable final String result = matcher.replaceAll(subst); System.out.println("Substitution result: " + result); } }

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