feat: parse path template using regexes (#823)

* get rid of pegjs

* clean up

* comments

* remove pegjs dependency

* error messages

* feedback

package.json

@@ -68,7 +68,6 @@
     "mocha": "^7.0.0",
     "ncp": "^2.0.0",
     "null-loader": "^4.0.0",
-    "pegjs": "~0.10.0",
     "proxyquire": "^2.0.1",
     "pumpify": "^2.0.0",
     "puppeteer": "^2.0.0",
@@ -88,7 +87,7 @@
     "test": "c8 mocha build/test/unit",
     "lint": "gts check",
     "clean": "gts clean",
-    "compile": "tsc -p . && cp src/*.json build/src && cp src/*.js build/src && cp -r test/fixtures build/test",
+    "compile": "tsc -p . && cp src/*.json build/src && cp -r test/fixtures build/test",
     "compile-operation-protos": "pbjs -t json google/longrunning/operations.proto -p ./protos > protos/operations.json && pbjs -t json google/rpc/status.proto google/rpc/error_details.proto google/protobuf/any.proto -p ./protos > protos/status.json && pbjs -t static-module google/longrunning/operations.proto -p ./protos > protos/operations.js && pbts protos/operations.js -o protos/operations.d.ts",
     "compile-iam-protos": "pbjs -t json google/iam/v1/iam_policy.proto google/iam/v1/options.proto google/iam/v1/policy.proto google/iam/v1/logging/audit_data.proto -p ./protos > protos/iam_service.json && pbjs -t static-module google/iam/v1/iam_policy.proto google/iam/v1/options.proto google/iam/v1/policy.proto google/iam/v1/logging/audit_data.proto -p ./protos > protos/iam_service.js && pbts protos/iam_service.js -o protos/iam_service.d.ts",
     "fix": "gts fix",