Matching A Username Description: Find The Beginning Of The String (A), Followed By Any Lowercase Letter (A-Z), Number (0-9), An Underscore, Or A Hyphen. Contain 13,16) Makes Sure That Are At Least 3 Of Those Characters, But No More Than 16. Finally, We Want The End Of The String (S). Ex: My-Us3r_n4m3 String That Doesn't Match: Th1s1s-Wayt00_10ngt0beausername

Matching a Hex Value String that matches: #a3b1 13 String that doesn't match: #4d8224 (contains the letter h)