regex to check the string contains only letter and numbers but not only numbers

Question

I need a help with regex which checks the string contains only letter and numbers but not only numbers

Valid

* letters
* 1wret
* 0123chars
* chars0123
*          


        

Answer 1

^[0-9]*[a-zA-Z]+[0-9a-zA-Z]*$

translated: from the beginning, match 0 or more numbers, then match at least one letter, then match zero or more letters or numbers until the end.