Regular expression for English characters

Can anybody help me in developing the regular expression for PHP that will help me to detect if the string has any English characters. What I mean by English characters is A-Z, a-z, 0-9 and all the other symbols on keyboard + some extra ones that are used frequently. I am not very good at regular expression.

 

What about the

Code:

!@#$%^&*()_+<>,.?/"':;{[]}\|

as far as I can remember.

 

But my concern is it can have the string as : ) only also.

 

Can you tell me what are the special characters in

Code:

!@#$%^&*()_+<>,.?/"':;{[]}\|

so that I can add the backslash. As far as I can get

Code:

$ , . { [ ] } \ 

Am I missing something?