Method peek

regex/regex-syntax/src/ast/parse.rs:583–588

Peek at the next character in the input without advancing the parser. If the input has been exhausted, then this returns `None`.

(&self)

    ///
    /// If the input has been exhausted, then this returns `None`.
    fn peek(&self) -> Option<char> {
        if self.is_eof() {
            return None;
        }
        self.pattern()[self.offset() + self.char().len_utf8()..].chars().next()
    }

    /// Like peek, but will ignore spaces when the parser is in whitespace
    /// insensitive mode.