C# Regex: Checking for “a-z” and “A-Z”

Question

I want to check if a string inputted in a character between a-z or A-Z. Somehow my regular expression doesn\'t seem to pick it up. It always returns true. I am not sure why,

Answer 1

Regex reg = new Regex("^[a-zA-Z]+$");

• ^ start of the string
• [] character set
• \+ one time or the more
• $ end of the string

^ and $ needed because you want validate all string, not part of the string