5. The following EBNF grammar describes the syntax of C's floating-point constants. Write a single Perl pattern that matches the strings that can be derived from [ ] [ ] cfract-constant> [ ] . ] l cexponent> [ ] I . l BI l + | - -> | 1 I 2 | 3 | 5 | 6 | 8 19 float-suffix> f | 1 | F | L 5. The following EBNF grammar describes the syntax of C's floating-point constants. Write a single Perl pattern that matches the strings that can be derived from [ ] [ ] cfract-constant> [ ] . ] l cexponent> [ ] I . l BI l + | - -> | 1 I 2 | 3 | 5 | 6 | 8 19 float-suffix> f | 1 | F | L