c#正则表达式格式

Question

I need a regex format:

1. Only letters

2. With no html tags

3. With no these spesific charaters ( and )

Please help.

Answer 1

You can combine your conditions into 1 Regex.Replace since you just remove every match:

SearchBy = Regex.Replace(SearchBy, @"<[^>]+>|[0-9()-]", string.Empty);

Or, since you just want only letters to remain in the string, you can use

SearchBy = Regex.Replace(SearchBy, @"<[^>]+>|\P{L}", string.Empty);

The regex contains 2 alternatives joined with |alternation operator:

• <[^>]+> - A substring starting with < , then 1 or more characters other than > and then > (however, this might remove anything that looks like a tag but is not a tag!)
• [0-9()-] - A character class matching all digits from 0 to 9, and literal ( , ) and - (when - is at the end of a character class, we do not have to escape it.)

Or \\P{L} that matches any non-letter.