[Cepillado]

Is there a way that I can detect if there is not a specific character in a string?

I've only found tutorials that explains how to find a character in a string, such as:

PHP код:

if(strfind(inputtext, " ") != -1) // Finds a blank space 


But what I need is to find if the player did not insert the character. For example a dot "." How can I check if there are no dots in the string?