Regular expression for a valid filename without extension

Question

I need a regular expression pattern to check a string for alphanumeric(a-zA-z0-9) and also can contain underscore, hypen and dot this will be a file name so i dont want othe

Answer 1

Re:

I need a regular expression pattern to check a string for alphanumeric(a-zA-z0-9) and also can contain underscore, hypen and dot

The pattern will be "[_a-zA-Z0-9\\-\\.]+"

Note the double-backslashes, since this is first interpreted as a Java string and the backslashes need to stay intact for the regex.