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- 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
- Regex that accepts only numbers (0-9) and NO characters
I need a regex that will accept only digits from 0-9 and nothing else No letters, no characters I thought this would work: ^[0-9] or even \d+ but these are accepting the characters : ^,$,(,), etc I thought that both the regexes above would do the trick and I'm not sure why its accepting those characters EDIT: This is exactly what I am doing:
- regex - What does \d+ mean in a regular expression? - Stack Overflow
What does \\d+ mean in a regular expression?
- regex - Matching up to the first occurrence of a character with a . . .
Be aware that the first ^ in this answer gives the regex a completely different meaning: It makes the regular expression look only for matches starting from the beginning of the string In this case, that would effectively be a no-op if you run the regular expression only once If you want to look for multiple matches within a single string
- regex - What are ^. * and . *$ in regular expressions? - Stack Overflow
That looks like a typical password validation regex, except it has couple of errors First, the * at the beginning doesn't belong there If any of those lookaheads doesn't succeed at the beginning of the string, there's no point applying them again at the next position, or the next, etc
- What does regular expression \\s*,\\s* do? - Stack Overflow
@Lupos \s is regex for “whitespace” To code a literal backslash in Java, you must escape the backslash with another backslash, so to code \s in the regex, you must code "\\s" in your program – Bohemian ♦
- regex - What is a non-capturing group in regular expressions? - Stack . . .
tl;dr non-capturing groups, as the name suggests are the parts of the regex that you do not want to be included in the capture and ?: is a way to define a group as being non-capturing Let's say you have an email address [email protected] The following regex will create two groups, the id part and @example com part (\p{Alpha}*[a-z])(@example
- 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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