[Doc] Update regex engine to Onigumo in doc/extension.* [ci skip]
regex.c has been removed in 8e65234086a15f90585bc09cce82dbad2aa647d7
[Doc] Update regex engine to Onigumo in doc/extension.* [ci skip]
regex.c has been removed in 8e65234086a15f90585bc09cce82dbad2aa647d7