regex - javascript check if string contains only alphanumeric...

I have found this function to check if a string only contains alphanumeric characters: … Now I would like to improve the above function to allow some other "special characters"...

javascript%2bregex%2breplace%2ball%2bbut%2bnumbers

regex - Javascript - Replace all non-alpha... - Stack Overflow

I need to replace all non alpha-numeric characters in a file name except for the period, I've been searching around and found close answers but not exact...

javascript%2bregex%2breplace%2ball%2bnon%2bnumeric

Replace all non alphanumeric characters using javascript

JavaScripting.com - The Database of JavaScript Libraries

javascript%2bregex%2bremove%2bnon%2balphanumeric

javascript%2bregex%2breplace%2btester

Методы RegExp и String