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- Regex: ?: notation (Question mark and colon notation)
The regex compiles fine, and there are already JUnit tests that show how it works It's just that I'm a bit confused about why the first question mark and colon are there
- regex - What does ?= mean in a regular expression? - Stack Overflow
May I know what ?= means in a regular expression? For example, what is its significance in this expression: (?= *\\d)
- regex - Carets in Regular Expressions - Stack Overflow
Specifically when does ^ mean "match start" and when does it mean "not the following" in regular expressions? From the Wikipedia article and other references, I've concluded it means the former a
- regex - Match linebreaks - \n or \r\n? - Stack Overflow
While writing this answer, I had to match exclusively on linebreaks instead of using the s-flag (dotall - dot matches linebreaks) The sites usually used to test regular expressions behave diffe
- Regex that accepts only numbers (0-9) and NO characters
By putting ^ at the beginning of your regex and $ at the end, you ensure that no other characters are allowed before or after your regex For example, the regex [0-9] matches the strings "9" as well as "A9B", but the regex ^[0-9]$ only matches "9"
- RegEx for matching A-Z, a-z, 0-9, _ and . - Stack Overflow
I need a regex which will allow only A-Z, a-z, 0-9, the _ character, and dot ( ) in the input I tried: [A-Za-z0-9_ ] But, it did not work How can I fix it?
- regex - Regular Expression to find a string included between two . . .
I need to extract from a string a set of characters which are included between two delimiters, without returning the delimiters themselves A simple example should be helpful: Target: extract the
- regex - Regular Expressions: Is there an AND operator? - Stack Overflow
In regex in general, ^ is negation only at the beginning of a character class Unless CMake is doing something really funky (to the point where calling their pattern matching language "regex" could be regarded as misleading or incorrect) I'm guessing the fact that it worked for you was an isolated accident
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