Regex Tester & Validator

This regex attempts to extract a person's full name into `fname` and `lname` named capture groups, separated by whitespace. However, it mistakenly uses character classes (`[firstname]` and `[lastname]`) instead of literal string matches. As a result, it actually matches any 3 or more characters from the set {f,i,r,s,t,n,a,m,e}, followed by a space and an optional lazy word, ending with 3 or more characters from {l,a,s,t,n,m}. It represents a flawed attempt at flexible name extraction or data sanitization.