fix(backend/sdoc_source_code): enable support for requirement identifiers with underscores #2574
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Context: Reported by the user in #2568.
Problem: Requirement identifiers with underscores are supported by language-aware parsers but the general source reader does not recognize these identifiers correctly, e.g.,
SF_REQ-001.Solution: Add underscores to the grammar regex.
P.S. A note to generalize/reuse the REQ UID regex between all parsers have been added to the code climate ticket: #2068.