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
Processing...

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 = "(?<=\\s|^)(\\w+)::\\1\\s*\\((?:.|\\n)*?\\)*([^\\{]+)"; final String string = "TropicalFruitTOutput::TropicalFruitTOutput()\n" + " : dad::CRunnable()\n" + " , m_strawberry_in()\n" + " , m_watermelon_out()\n" + "#if MAX_FRUITS == (10)\n" + " , m_cherry_out()\n" + " , m_grape_out()\n" + "#endif\n" + "{\n" + "}\n\n" + "NationalFruitInput::NationalFruitInput()\n" + " : dad::CRunnable()\n" + " , m_banana_in()\n" + " , m_apple_out()\n" + " , m_dragronFruit(PAD_GetdragronFruitPAD_B())\n" + "{\n" + "}\n\n" + "SpecialFruits::SpecialFruits()\n" + " : AmazingClassType()\n" + " , m_pineapple_in()\n" + " , m_kiwi()\n" + " , m_avocado( // PRQA S 2961 # FALSEPOSITIVE QAC warning about uninitialized\n" + " // Hello world\n" + " // This is just a comment for\n" + " // testing purpose\n" + " m_apricotController.getApricotList())\n" + "{\n" + "}\n\n" + "using NewFruitsBase::NewFruitsBase;\n\n" + "public:\n" + " bool Check(const kolaInterface& kolaInterface) override\n" + " {\n" + " // Get feature setmode enabled/disabled information\n" + " const bool aa = GET_HMI_INFO(kolaInterface).m_b;\n\n" + " m_isActive = (aa == true);\n\n" + " return m_isActive;\n" + " };"; final String subst = "$1::$1()$3"; 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