正则表达式删除非utf-8字符但新行

Question

I have a string which contains a new line feed and some non-utf8 characters. I'm trying to write some regex that will replace non utf-8 characters but it should keep the line endings.

Below is what I have from PHP

PHP preg_replace('/[\x00-\x1F\x80-\xFF]/', '', $string);

It's stripping the non utf-8 characters but it's also stripping the new line endings and I can't find out how to do this.

I've tried /[\x00-\x1F\x80-\xFF\^ ]/ but hasn't worked.

Answer 1

Add a negative lookahead at the start. Now this won't match newline character.

preg_replace('/(?!
)[\x00-\x1F\x80-\xFF]/', '', $string);

or

preg_replace('/(?![
])[\x00-\x1F\x80-\xFF]/', '', $string);