Function validate_complex

pub fn validate_complex(to_parse: &str, chrs: &Vec<char>) -> Option<String>

Validates the string to be parsed.

If the string to parse is empty or too long, this function will return an error message. Also, the string must not begin with a dollar sign or a parenthesis.

Argument

• to_parse - &str
• chars - vector of chars

Return

• Option - Some(error_message) or None