1. the following ebnf rules describe the syntax of decimal integer constants in c99. write a single perl pattern that matches these constants. simplify your pattern as much as possible. floating-literal: fractional-constant exponent-partopt floating-suffixopt digit-sequence exponent-part floating-suffixopt fractional-constant: digit-sequenceopt . digit-sequence digit-sequence . exponent-part: e signopt digit-sequence e signopt digit-sequence sign: + - digit-sequence: digit digit-sequence digit floating-suffix: f l f l