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 single character of: a, b, c or d
    [[ab][cd]]
  • 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]
  • Character class intersection
    [\w&&[^\d]]
  • 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 = "((((о|е|ё)(в|ц)а?)|((ы|и)на?))|(о|а(й|к|у|ч)?)|(к((о|и)й|ая))|(и(ч|ц))|((ы|и)(х|й)|ая)|((у|ю|о)(к|н|б))|(штейн|манн?|сон))\\b"; final String string = "Смирнов/Cмиров\n" + "Николаев/Николаева\n" + "Никитин/Никитина\n" + "Киселёв/Киселёва\n" + "Пятницын/Пятницына\n" + "Крыленко\n" + "Хованский/Хованская\n" + "Калита\n" + "Шемяка\n" + "Донской/Донская\n" + "Теплых\n" + "Усович\n" + "Царук\n" + "Нагорный/Нагорная\n" + "Деньнуб\n" + "Заренок\n" + "Шевчук\n" + "Драгун\n" + "Харинтон\n" + "Горбатых\n" + "Фидорец\n" + "Слободенюк\n" + "Кравчук\n" + "Голицын\n" + "Лифшиц\n" + "Либерман\n" + "Капица\n" + "Айнштейн\n" + "Лазерсон\n" + "Байдачный/Байдачная\n" + "Зварыкин/Зварыкина\n" + "Коллонтай\n" + "Cобчак\n" + "Ландау\n" + "Василец\n" + "Кучерявый\n" + "Бородач\n" + "Грицюк\n" + "Радаев\n" + "Белаец\n" + "Деев\n"; 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