Method write_regex_to

src/expr/src/scalar/like_pattern.rs:223–246

Converts a Subpattern to an equivalent regular expression and writes it to a given string.

(&self, r: &mut String)

impl Subpattern {
    /// Converts a Subpattern to an equivalent regular expression and writes it to a given string.
    fn write_regex_to(&self, r: &mut String) {
        match self.consume {
            0 => {
                if self.many {
                    r.push_str(".*");
                }
            }
            1 => {
                r.push('.');
                if self.many {
                    r.push('+');
                }
            }
            n => {
                r.push_str(".{");
                write!(r, "{}", n);
                if self.many {
                    r.push(',');
                }
                r.push('}');
            }
        }
        regex_syntax::escape_into(&self.suffix, r);
    }
}

fn is_match_subpatterns(subpatterns: &[Subpattern], mut text: &str) -> bool {