Checking for letters and numbers

Guys, i need to check a String to see if contains either letters or numbers and nothing else. I know that there's certain function is could use like:
1. isNum() - to check for numbers
2. isChar()-to check for letters
but the things is that i get error when i tried to use either 1 of these methods.
So is there any other methods i could use to do this validation??
Thx Guys

Ooo.. i saw that 2 method too but it says that it onli accept character but not string and wat i wan to check is a String.

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