仅当未跟随另一个特定字符串时才匹配字符串

Question

I have #[\\s]+on[az]+[\\s]*=#si . I need to match ( preg_replace ) string like onclick = but only if this string isn't followed by another specific string.

Example (bold is the match)

some text onClickOrWhatever = some text

some text onClickOrWhatever = my special string some text

Second line shouldn't be matched because the expression is follow by "my special string". In another words, I need to keep intact specific inline javascript but remove(destroy) any other.

This expression is a little too general. It would also partially match you told me once =) , I am aware of that.

Answer 1

Well to answer your question, you can use negative lookahead :

#\s+on[a-z]+\s*=(?!\s*my special string)#i

You also don't need s flag here which is used for making DOT match newline .