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/…
Regex: ?: notation (Question mark and colon notation)
Dec 8, 2018 · 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 - Carets in Regular Expressions - Stack Overflow
Jun 1, 2017 · 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 …
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 …
regex - What does ?= mean in a regular expression? - Stack …
Oct 15, 2009 · May I know what ?= means in a regular expression? For example, what is its significance in this expression: (?=.*\\d).
javascript - What is the need for caret (^) and dollar symbol ($) in ...
Javascript RegExp () allows you to specify a multi-line mode (m) which changes the behavior of ^ and $. ^ represents the start of the current line in multi-line mode, otherwise the start of the …
regex - What's the difference between () and - Stack Overflow
The regex [a-z] will match any letter a through z. The () construct is a grouping construct establishing a precedence order (it also has impact on accessing matched substrings but …
regex - Question marks in regular expressions - Stack Overflow
Apr 7, 2011 · I'm reading the regular expressions reference and I'm thinking about ? and ?? characters. Could you explain me with some examples their usefulness? I don't understand …
regex - What is a non-capturing group in regular expressions?
Aug 18, 2010 · What is also important there is that regex with non-capturing groups (?: is much faster than the same regex with capturing groups ' ('. So we should use non-capturing groups …
python - In regex, what does [\w*] mean? - Stack Overflow
Oct 16, 2009 · Quick answer: ^[\w*]$ will match a string consisting of a single character, where that character is alphanumeric (letters, numbers) an underscore (_) or an asterisk (*). Details: …