Question

I need to create a regular expression to match a string that contains anything other than the specified characters. The characters are

a-z A-Z 0-9
+ – * / : . $ %
and a space

I’m not very familiar with regex so I’m unsure how to put it together and test it. I can find lots of cheat sheets but I don’t know how to actually structure it as one whole pattern.

Answer 1

a ^ in a capture group character class negates those characters in the class. So:

[^a-zA-Z0-9+\-*/:.]

Some characters there are special chars in regex so they’re escaped with \.