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

/
/
gi

Test String

Substitution

Processing...

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 = "'([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*([^a']*)a*'"; final String string = "This is a text sample.\n" + "'And this is a single-quoted text sample'.\n" + "And this is another text sample.\n" + "\"And this is a double-quoted text sample\".\n" + "And this is another text sample.\n" + "\"Nothing to do here\".\n" + "And this is another text sample.\n" + "'Nothing to do here'.\n" + "And this is another text sample.\n" + "'And this is another single-quoted text sample'.\n" + "And this is another text sample.\n" + "\"And this is another double-quoted text sample with a lot of a characters a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a\".\n"; final String subst = "'\\1\\2\\3\\4\\5\\6\\7\\8\\9\\10\\11\\12\\13\\14\\15\\16\\17\\18\\19\\20\\21\\22\\23\\24\\25\\26\\27\\28\\29\\30\\31\\32\\33\\34\\35\\36\\37\\38\\39\\40\\41\\42\\43\\44\\45\\46\\47\\48\\49\\50\\51\\52\\53\\54\\55\\56\\57\\58\\59\\60\\61\\62\\63\\64\\65\\66\\67\\68\\69\\70\\71\\72\\73\\74\\75\\76\\77\\78\\79\\80\\81\\82\\83\\84\\85\\86\\87\\88\\89\\90\\91\\92\\93\\94\\95\\96\\97\\98\\99'"; final Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE); 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