Update mypy file exclusion to use regex search

- Due to similar issues as was happening in #2727, ``mypy`` looks for regular expressions which led to issues running ``make lint`` locally.

Author: fselmo

newsfragments/2734.internal.rst

@@ -0,0 +1 @@
+Use regex pattern for ``mypy`` command for ``tox`` / ``make lint`` linting commands.

tox.ini

@@ -66,7 +66,7 @@ commands=
     flake8 {toxinidir}/web3 {toxinidir}/ens {toxinidir}/ethpm {toxinidir}/tests --exclude {toxinidir}/ethpm/ethpm-spec,{toxinidir}/**/*_pb2.py
     black {toxinidir}/ens {toxinidir}/ethpm {toxinidir}/web3 {toxinidir}/tests {toxinidir}/setup.py --exclude /ethpm/ethpm-spec/|/ethpm/_utils/protobuf/ipfs_file_pb2\.py --check
     isort --recursive --skip {toxinidir}/ethpm/_utils/protobuf/ipfs_file_pb2.py --skip {toxinidir}/ethpm/ethpm-spec --check-only --diff {toxinidir}/web3/ {toxinidir}/ens/ {toxinidir}/ethpm/ {toxinidir}/tests/
-    mypy -p web3 -p ethpm -p ens --exclude {toxinidir}/ethpm/_utils/protobuf/ipfs_file_pb2.py --config-file {toxinidir}/mypy.ini
+    mypy -p web3 -p ethpm -p ens --exclude ethpm/_utils/protobuf/ipfs_file_pb2\.py --config-file {toxinidir}/mypy.ini
 
 [testenv:benchmark]
 basepython=python