Saving A Clean String

[Jonathan Fleming]

How can I go about making sure that no bad or special characters are entered into a string?
Basically I'd like the string to be of ascii characters only or those that can be used in an image filename on the web.
Thanks
Jonathan :^)

[Max Habibi]

hi Jonathan,
If you're using java 1.4+, you can try

boolean isOk = candidateString.matches("\\w+\\.\\w+");

In English: "I'm going to describe a String: if my description matches this particular candidate String exactly, then return true, else false.
The description is this: I'd like any sequence of letters, numbers, or underscores, repeated one or more times. Then, I'd like a period. then, I'd like any sequence of letters, numbers, or underscores, repeated one or more times"
HTH,
M