[Resolved] Regular Expression Help

[joe2]

Hi,

i have a

$str = "test's file one";

i want output as

tests_file_one

using regular expression. Special character (single quotes in example) can any special character.
Please help.

Thanks in advance.

[mrhappiness]

replace everything that's not a letter or whitespace [^ a-z] with nothing

replace whitespace with _

[joe2]

Thanks a lot.