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 float- constants [ I-float-suffix> 1 fract-constant> [ I e [ ] l digit-sequences cexponents I cfloat-suffix>1 I sdigit-sequence E [ | + | - I 0 | 1 | 2 | 3 | 4 | 5 | 6 | 8 | 9 f | 1 | F | L