否则该标志被设置为re.I或re.IGNORECASE;这使得匹配不区分大小写，使得permission denied也可以写成Permissi...
aiLmsux-imsx:...)标题下进行了记录，如下所示：
1. What does it mean when my regular expression has a font color of red? For example, .* is displayed in red color. 2. Specific question:———- Regular expression: 9* Text input: 99 99999 99———- I noticed it only matched the first line, 99, but no subsequent lines. Is there...
| [Character] | What does it mean? | Example grammar | 正则表达式的结果 | | --- | --- | --- | --- | | [] | []可用于包含或排除给定范围,甚至专门提到我们想要包含或排除的字符。 [ ]表示在一个范围内包括两者。 | “【B- f】an” | ban、can、dan、 ean、fan | | { } | 当...
Breaking down this regex, here's what we get: [\w\.\-]+ is a username that may include 1 or more alphanumeric characters, underscores, dots and hyphens. @ symbol [A-Za-z0-9\.\-]+ is a domain name consisting of: uppercase and lowercase letters, digits, hyphens and dots (in case...
Regex is an incredibly useful tool, but that doesn't mean you should use it everywhere. If there is an alternative solution to a problem, which is simpler and/or does not require the use of regular expressions, please do not use regex just to feel clever. Regex is great, but it is ...
Here, by "obviously", I think you mean something other than its traditional meaning, unless you had a typo in your original regex. If the first "*" accepts any characters, what's the ".*" part do? Well is it wrong?. But i guess ".*" would be appropriate with the pattern being...
You can also use a negated character class, which means “capture everything except these characters.” A negated class starts with [^, so [^AEIOUaeiou] would mean “Capture everything that’s not a vowel.” This is a handy way to do things like capture whatever is delimited in quotes...
would mean that the URLs must start with http and they can be either http or https. It can also turn greedy matches into lazy ones when used with quantifiers, but now we are sliding into a lot more RegEx than is needed. You might not be able to master RegEx yet, but you can certai...
This does mean, though, that you may sometimes have to explicitly specify the type you want, especially if you're trying things out at the REPL.Common use casesGet the first match-- returns empty string if no match a =~ b :: String -- or ByteString, or Text... λ> "alexis-de-...