Use regex for generating string when regex pattern is found

[Markoutte]

Description

At the moment fuzzing cannot generate proper string for simple regex patters.

Expected behavior

Fuzzing should generate proper string that matches to regex like

[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}
[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?([fFdD]?)

Potential alternatives

Look into discussion about fuzzer data optimization