Regular expression that allows letters (like "ñ") from any language

Question

trying to let users use special characters in other languages such as Spanish or French. I originally had this:

 "/[^A-Za-z0-9\.\_\- ]/i" 

and then changed it to

 "/[^\p{L}\p{N}\.\_\-\(\) ]/i" 

but still doesn't work. letters such as "ñ" should be allowed. Thanks.

Revision: I found that adding a (*UTF8) at the beginning helps solve the problem. So I'm using the following code:"/(*UTF8)[^\p{L}A-Za-z0-9._- ]/i"

Revision: After looking at the answers I decided to use: "/[^\p{Xwd}. -]/u". Thanks(It works even with the Chinese alphabet.

Answer 1

for latin languages you can use the \p{Latin} character class:

/[^\p{Latin}0-9._ -]/u

But if you want all other letters and digits:

/[^\p{Xwd}. -]/u

The "u" modifier indicates that the string must be read as an unicode string.