fix(documentator): `Preprocessor` regexp mode (added `u` flag). #530

Job	Run time
Settings / Detect Packages	2s
Sync package: core	7s
Sync package: documentator	9s
Sync package: eloquent	10s
Sync package: formatter	7s
Sync package: graphql-printer	10s
Sync package: graphql	9s
Sync package: migrator	10s
Sync package: serializer	9s
Sync package: spa	6s
Sync package: testing	7s
	1m 26s

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