Regular expression in sh:pattern not processed correctly

[rdflib]

Regular expression in sh:pattern not processed correctly

[debarghadas411]

This problem is not of pySHACL but rdfLib library as rdfLib processes the shape file into rdf graph and during that processing, it is decoding the regular expression which is essentially the problem you are referring to

[ashleysommer]

Hi @James-Hudson3010
Sorry I didn't see this Issue come through, I only got notification when @debarghadas411 commented on it.
Yes, it is a problem with the .ttl parser in rdflib. Can you try this?:
sh:pattern ".*\\.txt" .

[James-Hudson3010]

That does appear to work.

It this a bug that should be reported to RDFLib then? Or, should this be considered expected behavior?

[debarghadas411]

I feel its a bug because sh:pattern ".*\\.txt" adds an extra escape character which should not be the case. sh:pattern should have a normal regular expression as object

[bhavya17037]

You can use another escape character after the '*', like mentioned above
something like:
.*\\.txt

[ashleysommer]

Issue was closed in pyshacl.
This is a turtle spec problem. and we can't change the turtle spec to allow new escape sequences.
The solution provided above is the correct solution for this problem.