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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 - Matching up to the first occurrence of a character with a . . .
Be aware that the first ^ in this answer gives the regex a completely different meaning: It makes the regular expression look only for matches starting from the beginning of the string
- 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 - Regular Expressions- Match Anything - Stack Overflow
Normally the dot matches any character except newlines So if * isn't working, set the "dot matches newlines, too" option (or use (?s) *) If you're using JavaScript, which doesn't have a "dotall" option, try [\s\S]* This means "match any number of characters that are either whitespace or non-whitespace" - effectively "match any string" Another option that only works for JavaScript (and is
- regex - What are ^. * and . *$ in regular expressions? - Stack Overflow
In case it is JS it indicates the start and end of the regex, like quotes for strings stackoverflow com questions 15661969 …
- What does regular expression \\s*,\\s* do? - Stack Overflow
That regex "\\s*,\\s*" means: \s* any number of whitespace characters a comma \s* any number of whitespace characters which will split on commas and consume any spaces either side
- 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 - 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
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