Function build_regex_from_pattern 

pub fn build_regex_from_pattern(pat: &str) -> Result<String, PatternError>

Build an anchored regular expression from lexed pattern tokens.

Errors

Returns PatternError when the tokens describe malformed placeholders or unbalanced braces.

Examples

let regex = build_regex_from_pattern("Given {item}")
    .expect("example ensures fallible call succeeds");
assert_eq!(regex, r"^Given (.+?)$");