Closes #1931 "🤗 How to get path param before a custom verb?" (#1983)

* Add possibility for parameters before custom verb
FIX for "🤗 How to get path param before a custom verb? #1931"

* try to stabilize the tests

middleware/proxy/proxy_test.go

@@ -124,7 +124,7 @@ func Test_Proxy_Balancer_WithTlsConfig(t *testing.T) {
 
 // go test -run Test_Proxy_Forward_WithTlsConfig_To_Http
 func Test_Proxy_Forward_WithTlsConfig_To_Http(t *testing.T) {
-	t.Parallel()
+	//t.Parallel()
 
 	_, targetAddr := createProxyTestServer(func(c *fiber.Ctx) error {
 		return c.SendString("hello from target")

path.go

@@ -58,7 +58,7 @@ var (
 	// list of chars for the parameter recognising
 	parameterStartChars = []byte{wildcardParam, plusParam, paramStarterChar}
 	// list of chars of delimiters and the starting parameter name char
-	parameterDelimiterChars = append([]byte{paramStarterChar}, routeDelimiter...)
+	parameterDelimiterChars = append([]byte{paramStarterChar, escapeChar}, routeDelimiter...)
 	// list of chars to find the end of a parameter
 	parameterEndChars = append([]byte{optionalParam}, parameterDelimiterChars...)
 )

path_test.go

@@ -47,6 +47,17 @@ func Test_Path_parseRoute(t *testing.T) {
 		},
 		params: nil,
 	}, rp)
+
+	rp = parseRoute("/v1/some/resource/:name\\:customVerb")
+	utils.AssertEqual(t, routeParser{
+		segs: []*routeSegment{
+			{Const: "/v1/some/resource/", Length: 18},
+			{IsParam: true, ParamName: "name", ComparePart: ":customVerb", PartCount: 1},
+			{Const: ":customVerb", Length: 11, IsLast: true},
+		},
+		params: []string{"name"},
+	}, rp)
+
 	// heavy test with escaped charaters
 	rp = parseRoute("/v1/some/resource/name\\\\:customVerb?\\?/:param/*")
 	utils.AssertEqual(t, routeParser{
@@ -170,6 +181,10 @@ func Test_Path_matchParams(t *testing.T) {
 		{url: "/v1/some/resource/name:customVerb", params: nil, match: true},
 		{url: "/v1/some/resource/name:test", params: nil, match: false},
 	})
+	testCase("/v1/some/resource/:name\\:customVerb", []testparams{
+		{url: "/v1/some/resource/test:customVerb", params: []string{"test"}, match: true},
+		{url: "/v1/some/resource/test:test", params: nil, match: false},
+	})
 	testCase("/v1/some/resource/name\\\\:customVerb?\\?/:param/*", []testparams{
 		{url: "/v1/some/resource/name:customVerb??/test/optionalWildCard/character", params: []string{"test", "optionalWildCard/character"}, match: true},
 		{url: "/v1/some/resource/name:customVerb??/test", params: []string{"test", ""}, match: true},