E0080

Warning name: regex_match_missing_before

A lexmatch pattern can skip an input prefix, but the pattern does not bind or explicitly ignore that prefix.

An unanchored regex searches forward from the start of the input. Add ^ when the match must start at the beginning, or add before= to bind or ignore the skipped prefix.

Erroneous example

///|
pub fn ends_with_digits(input : String) -> Bool {
  lexmatch input {
    re"[0-9]+$" => true
    _ => false
  }
}

Suggestion

Anchor the regex at the start, or make the skipped prefix explicit with before=prefix or before=_.

///|
pub fn ends_with_digits(input : String) -> Bool {
  lexmatch input {
    (re"[0-9]+$", before=_) => true
    _ => false
  }
}