- 123
In Java, the colon : does not have a special meaning in regular expressions. It can be used as a literal character without needing to be escaped1.
Example
String pattern = "[A-Za-z0-9.,:-]*";String input = "example:123";boolean matches = input.matches(pattern);System.out.println(matches); // prints trueIn this example, the pattern [A-Za-z0-9.,:-]* matches any combination of alphanumeric characters, commas, periods, colons, and hyphens1.
Important Considerations
Character Classes: When using character classes (e.g., [A-Za-z0-9.,:-]), the hyphen - should be placed at the start or end to avoid being interpreted as a range operator1.
Non-Capturing Groups: The colon can also appear in non-capturing groups, denoted by (?:...), which group expressions without creating backreferences2.
Alternative Solutions
If you need to match a colon in different contexts, you can use it directly in your regex pattern without escaping it.
use of colon symbol in regular expression - Stack Overflow
2020年12月28日 · Colon : is simply colon. It means nothing, except special cases like, for example, clustering without capturing (also known as a non-capturing group): (?:pattern) Also …
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In regular expressions, the colon (:) character is generally used without needing to escape it, except in specific contexts (like character classes). When you want to include a literal colon in …
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2023年11月13日 · Learn how to add colons in regular expressions (regex) with this comprehensive tutorial. Discover the significance, use cases, and step-by-step examples of …
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How to type ":" ("colon") in regexp? - pvq.app
In regexp, the : (colon) has a special meaning as a non-capturing group. If you want to match a literal colon character, you need to escape it with \ like this: \: . So in your case, to match any …
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2024年11月6日 · The colon : delimits the two parts. If you want a literal colon in the matched part, then you need to escape it with a backslash. If you want a literal closing parenthesis anywhere …
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