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 = "^Item([1-9]|[1-4][0-9]|50)$"; final String string = "Winst\n" + "Item1\n" + "Item2\n" + "Item3\n" + "Item4\n" + "Item5\n" + "Item6\n" + "Item7\n" + "Item8\n" + "Item9\n" + "Item10\n" + "Item11\n" + "Item12\n" + "Item13\n" + "Item14\n" + "Item15\n" + "Item16\n" + "Item17\n" + "Item18\n" + "Item19\n" + "Item20\n" + "Item21\n" + "Item22\n" + "Item23\n" + "Item24\n" + "Item25\n" + "Item26\n" + "Item27\n" + "Item28\n" + "Item29\n" + "Item30\n" + "Item31\n" + "Item32\n" + "Item33\n" + "Item34\n" + "Item35\n" + "Item36\n" + "Item37\n" + "Item38\n" + "Item39\n" + "Item40\n" + "Item41\n" + "Item42\n" + "Item43\n" + "Item44\n" + "Item45\n" + "Item46\n" + "Item47\n" + "Item48\n" + "Item49\n" + "Item50\n" + "Item51\n" + "Item52\n" + "Item53\n" + "Item54\n" + "Item55\n" + "Item56\n" + "Item57\n" + "Item58\n" + "Item59\n" + "Item60\n" + "Item61\n" + "Item62\n" + "Item63\n" + "Item64\n" + "Item65\n" + "Item66\n" + "Item67\n" + "Item68\n" + "Item69\n" + "Item70\n" + "Item71\n" + "Item72\n" + "Item73\n" + "Item74\n" + "Item75\n" + "Item76\n" + "Item77\n" + "Item78\n" + "Item79\n" + "Item80\n" + "Item81\n" + "Item82\n" + "Item83\n" + "Item84\n" + "Item85\n" + "Item86\n" + "Item87\n" + "Item88\n" + "Item89\n" + "Item90\n" + "Item91\n" + "Item92\n" + "Item93\n" + "Item94\n" + "Item95\n" + "Item96\n" + "Item97\n" + "Item98\n" + "Item99\n" + "Item100 "; 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