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

/
/
iuxg

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 = "(^|\\R)((.*(\\b|\\.))\\s-\\s\\b(.*(\\b|\\.)))(\\R|$)"; final String string = "Одесса - Москва\n\n" + "Москва - Одесса\n\n" + "Абу куку ари гами - Салат\n\n" + "Салат - Абу куку ари гами\n\n" + "Абакан - Алтайская\n\n" + "Вязовая - Золотинка\n\n" + "Кемь - Семигородная\n\n" + "Можга - Иланская\n\n" + "Ясногорск - Тарбагатай\n\n" + "Выя - рзд.135км\n\n" + "134 - 8787\n\n" + "134 км - 8787\n\n" + "Кежемская - Сальск\n\n" + "Вышний Волочёк - Санкт-Петербуг\n\n" + "Кежемская - Зимовники\n\n" + "Могойтуй - Тинская\n\n" + "Пыть-Ях - Усть-Юган\n\n" + "Торбеево - Сызрань\n\n" + "Ясная - Забайкальск\n\n" + "Вышний Волочёк - Санкт-Петербург\n\n" + "Могойтуй - Улан-Удэ\n\n" + "Улан-Батор - Балезино\n\n" + "Ангарск - Номжа\n\n" + "Дальнереченск - Находка\n\n" + "Коксу - Сеятель\n\n" + "Неверовская - Ульба-Перевалочная\n\n" + "Россошь - Моздок\n\n" + "Улан-Батор - Барабинск\n\n" + "Ангарск - рзд.№71\n\n" + "Остров Н.О. - рзд.303км\n\n" + "рзд.303км - Аксака\n\n" + "Гротовский - Семиглавый Мар\n\n" + "Княжая - Масельская\n\n" + "Мюд - Кесова Гора\n\n" + "рзд.Туюн - Уркальту\n\n" + "Тяжин - Чильчи\n\n" + "Мюд - Москва\n\n" + "Вязьма - Остров Н.О.\n\n" + "Москва - Берлин\n\n" + "Кенада - рзд.303км"; final Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE | Pattern.COMMENTS); 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