What's new?

• new AbstractMatcher methods chr_last() and wchr_last() to extract the last character of a matching pattern, which is useful in lexers e.g. yytext[yyleng-1] is simply chr_last()
• new AbstractMatcher methods chr_next() and wchr_next() to inspect the next character in the input without consuming it, i.e. the character that follows a match or EOF
• new AbstractMatcher method empty() to check if a match is empty (same as size() == 0), useful when searching, splitting or matching input
• add new example words.l with %option find to search input