Assuming you want the whole regex to ignore case, you should look for the i flag. Nearly all regex engines support it: Check the documentation for your language/platform/tool to find how the matching modes are specified. If you want only part of the regex to be case insensitive (as my original answer presumed), then you … Read more
Your regex should work ‘as-is’. Assuming that it is doing what you want it to. This means match wordA followed by 0 or more spaces followed by wordB, but do not match if followed by wordc. Note the single space between ?! and wordc which means that wordA wordB wordc will not match, but wordA wordB wordc will. Here are some example matches and the associated replacement output: Note … Read more
es, you can. That should work. . = any char except newline \. = the actual dot character .? = .{0,1} = match any char except newline zero or one times .* = .{0,} = match any char except newline zero or more times .+ = .{1,} = match any char except newline one or … Read more
The confusion stems from your thinking \b matches spaces (probably because “b” suggests “blank”). \b matches the empty string at the beginning or end of a word. \B matches the empty string not at the beginning or end of a word. The key here is that “-” is not a part of a word. So … Read more
I have this regex: I tested this with the following regex tool link Can you please tell me how to do to accept and space? Accept eg: John Smith Thanks in advance!
No, there’s no direct not operator. At least not the way you hope for. You can use a zero-width negative lookahead, however: The (?!…) part means “only match if the text following (hence: lookahead) this doesn’t (hence: negative) match this. But it doesn’t actually consume the characters it matches (hence: zero-width). There are actually 4 … Read more
If you’re looking for a space, that would be ” ” (one space). If you’re looking for one or more, it’s ” *” (that’s two spaces and an asterisk) or ” +” (one space and a plus). If you’re looking for common spacing, use “[ X]” or “[ X][ X]*” or “[ X]+” where X … Read more
The notion that regex doesn’t support inverse matching is not entirely true. You can mimic this behavior by using negative look-arounds: The regex above will match any string, or line without a line break, not containing the (sub)string ‘hede’. As mentioned, this is not something regex is “good” at (or should do), but still, it … Read more
The fully RFC 822 compliant regex is inefficient and obscure because of its length. Fortunately, RFC 822 was superseded twice and the current specification for email addresses is RFC 5322. RFC 5322 leads to a regex that can be understood if studied for a few minutes and is efficient enough for actual use. One RFC … Read more
You need the put the characters you wish to split on in a character class, which tells the regular expression engine “any of these characters is a match”. For your purposes, this would look like: Although dashes have special meaning in character classes as a range specifier (ie [a-z] means the same as [abcdefghijklmnopqrstuvwxyz]), if you put it as … Read more