diff --git a/README.md b/README.md
index cf343fc..159077b 100644
--- a/README.md
+++ b/README.md
@@ -237,6 +237,36 @@ init {
 
 ```
 
+### Configure matching rules
+
+You can specify matching rules for both requests and responses to make your contracts more flexible. This is useful when you want to define patterns rather than exact values.
+
+```kotlin
+every {
+    restTemplate.exchange(
+        match<URI> { it.path.contains("user-service") },
+        HttpMethod.GET,
+        any(),
+        any<ParameterizedTypeReference<List<User>>>()
+    )
+} willRespondWith {
+    description("list users")
+    // Define rules for request headers
+    requestMatchingRules {
+        header("Authorization", Matcher(Matcher.MatchEnum.REGEX, "Bearer .*"))
+    }
+    // Define rules for response body
+    responseMatchingRules {
+        body("[*].id", Matcher(Matcher.MatchEnum.TYPE))
+    }
+    ResponseEntity.ok(listOf(USER_1, USER_2))
+}
+```
+
+In this example:
+- The request matching rule ensures the Authorization header matches the pattern "Bearer" followed by any string
+- The response matching rule specifies that each user ID in the array should match by type rather than exact value
+
 ### Change the pact directory
 
 By default, the generated pacts are stored in `src/test/resources/pacts`. You can configure that in the pact options:
diff --git a/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/InteractionBuilder.kt b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/InteractionBuilder.kt
index 5fc5ae9..abe0d20 100644
--- a/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/InteractionBuilder.kt
+++ b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/InteractionBuilder.kt
@@ -5,6 +5,10 @@ interface InteractionBuilder {
 
     fun providerState(providerState: String, params: Map<String, Any?> ? = null): InteractionBuilder
 
+    fun requestMatchingRules(block: MatchingRulesBuilder.() -> Unit): InteractionBuilder
+    
+    fun responseMatchingRules(block: MatchingRulesBuilder.() -> Unit): InteractionBuilder
 
     fun build(request: Pact.Interaction.Request, response: Pact.Interaction.Response): Pact.Interaction
+
 }
diff --git a/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/InteractionBuilderImpl.kt b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/InteractionBuilderImpl.kt
index d0c70f8..efb6251 100644
--- a/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/InteractionBuilderImpl.kt
+++ b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/InteractionBuilderImpl.kt
@@ -3,6 +3,8 @@ package io.github.ludorival.pactjvm.mockk
 class InteractionBuilderImpl : InteractionBuilder {
 
     private var description: String? = null
+    private val requestMatchingRulesBuilder: MatchingRulesBuilder = MatchingRulesBuilder()
+    private val responseMatchingRulesBuilder: MatchingRulesBuilder = MatchingRulesBuilder()
     private val providerStates: MutableList<Pact.Interaction.ProviderState> = mutableListOf()
     override fun description(description: String): InteractionBuilder = apply { this.description = description }
 
@@ -15,9 +17,17 @@ class InteractionBuilderImpl : InteractionBuilder {
             description = description
                 ?: "${request.method} ${request.path}?${request.query ?: ""} returns ${response.status}",
             providerStates = providerStates.ifEmpty { null },
-            request = request,
-            response = response
+            request = request.copy(matchingRules = requestMatchingRulesBuilder.build()) ,
+            response = response.copy(matchingRules = responseMatchingRulesBuilder.build())
         )
     }
 
+    override fun responseMatchingRules(block: MatchingRulesBuilder.() -> Unit): InteractionBuilder = apply {
+        responseMatchingRulesBuilder.apply(block)
+    }
+
+    override fun requestMatchingRules(block: MatchingRulesBuilder.() -> Unit): InteractionBuilder = apply {
+        requestMatchingRulesBuilder.apply(block)
+    }
+
 }
\ No newline at end of file
diff --git a/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Matcher.kt b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Matcher.kt
new file mode 100644
index 0000000..f2157c2
--- /dev/null
+++ b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Matcher.kt
@@ -0,0 +1,29 @@
+package io.github.ludorival.pactjvm.mockk
+
+import com.fasterxml.jackson.annotation.JsonProperty
+
+data class Matcher(
+            val match: MatchEnum,
+            val regex: String? = null,
+            val max: Number? = null,
+            val min: Number? = null,
+            val value: String? = null,
+            val format: String? = null
+        ) {
+            enum class MatchEnum {
+                @JsonProperty("regex") REGEX,
+                @JsonProperty("type") TYPE,
+                @JsonProperty("boolean") BOOLEAN,
+                @JsonProperty("contentType") CONTENT_TYPE,
+                @JsonProperty("date") DATE,
+                @JsonProperty("datetime") DATETIME,
+                @JsonProperty("decimal") DECIMAL,
+                @JsonProperty("equality") EQUALITY,
+                @JsonProperty("include") INCLUDE,
+                @JsonProperty("integer") INTEGER,
+                @JsonProperty("null") NULL,
+                @JsonProperty("number") NUMBER,
+                @JsonProperty("time") TIME,
+                @JsonProperty("values") VALUES
+            }
+}
diff --git a/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/MatchingRulesBuilder.kt b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/MatchingRulesBuilder.kt
new file mode 100644
index 0000000..d372036
--- /dev/null
+++ b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/MatchingRulesBuilder.kt
@@ -0,0 +1,21 @@
+package io.github.ludorival.pactjvm.mockk
+
+class MatchingRulesBuilder {
+        private val body = mutableMapOf<String, Matcher>()
+        private val header = mutableMapOf<String, Matcher>()
+        private val path = mutableMapOf<String, Matcher>()
+        private val query = mutableMapOf<String, Matcher>()
+
+        fun body(path: String, matcher: Matcher ): MatchingRulesBuilder = apply { this.body[path] = matcher } 
+        fun header(path: String, matcher: Matcher ): MatchingRulesBuilder = apply { this.header[path] = matcher }   
+        fun path(path: String, matcher: Matcher ): MatchingRulesBuilder = apply { this.path[path] = matcher } 
+        fun query(path: String, matcher: Matcher ): MatchingRulesBuilder = apply { this.query[path] = matcher } 
+
+        fun build(): Pact.Interaction.MatchingRules? = 
+            Pact.Interaction.MatchingRules(
+                body = body.toMap().ifEmpty { null },
+                header = header.toMap().ifEmpty { null },
+                path = path.toMap().ifEmpty { null },
+                query = query.toMap().ifEmpty { null }
+            ).takeIf { it.body != null || it.header != null || it.path != null || it.query != null  }
+    }
diff --git a/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Pact.kt b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Pact.kt
index ae2d8b8..2c6b6da 100644
--- a/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Pact.kt
+++ b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Pact.kt
@@ -33,17 +33,26 @@ data class Pact(
             val path: String,
             val query: String? = null,
             val headers: Map<String, String>? = null,
-            val body: Any? = null
+            val body: Any? = null,
+            val matchingRules: MatchingRules? = null
         ) {
             enum class Method {
                 GET, HEAD, POST, PUT, PATCH, DELETE, OPTIONS, TRACE
             }
         }
 
+        data class MatchingRules(
+            val body: Map<String, Matcher>? = null,
+            val header: Map<String, Matcher>? = null,
+            val path: Map<String, Matcher>? = null,
+            val query: Map<String, Matcher>? = null
+        )
+        
         data class Response(
             val body: Any?,
             val status: Int = 200,
-            val headers: Map<String, String>? = null
+            val headers: Map<String, String>? = null,
+            val matchingRules: MatchingRules? = null
         )
     }
 
diff --git a/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Utils.kt b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Utils.kt
index 305ca28..6709b46 100644
--- a/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Utils.kt
+++ b/pact-jvm-mockk-core/src/main/kotlin/io/github/ludorival/pactjvm/mockk/Utils.kt
@@ -4,6 +4,7 @@ import com.fasterxml.jackson.core.JsonGenerator
 import com.fasterxml.jackson.databind.JsonSerializer
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.databind.SerializerProvider
+import com.fasterxml.jackson.annotation.JsonInclude
 
 inline fun <reified T> serializerWith(crossinline supplier: (JsonGenerator) -> Unit) = object : JsonSerializer<T>() {
     override fun serialize(value: T, gen: JsonGenerator, serializers: SerializerProvider?) {
@@ -17,5 +18,6 @@ inline fun <reified T> serializerAsDefault(defaultValue: String) =
 
 fun Pact.Interaction.getConsumerName() = request.path.split("/").first { it.isNotBlank() }
 
-internal val DEFAULT_OBJECT_MAPPER = ObjectMapper()
+
+internal val DEFAULT_OBJECT_MAPPER = ObjectMapper().apply { setSerializationInclusion(JsonInclude.Include.NON_NULL) }
 
diff --git a/pact-jvm-mockk-spring/src/test/kotlin/io/github/ludorival/pactjvm/mockk/spring/NonDeterministicPact.kt b/pact-jvm-mockk-spring/src/test/kotlin/io/github/ludorival/pactjvm/mockk/spring/NonDeterministicPact.kt
index 94735a5..d9a858b 100644
--- a/pact-jvm-mockk-spring/src/test/kotlin/io/github/ludorival/pactjvm/mockk/spring/NonDeterministicPact.kt
+++ b/pact-jvm-mockk-spring/src/test/kotlin/io/github/ludorival/pactjvm/mockk/spring/NonDeterministicPact.kt
@@ -1,5 +1,6 @@
 package io.github.ludorival.pactjvm.mockk.spring
 
+import com.fasterxml.jackson.annotation.JsonInclude
 import com.fasterxml.jackson.databind.ObjectMapper
 import io.github.ludorival.pactjvm.mockk.PactOptions
 import io.github.ludorival.pactjvm.mockk.pactOptions
@@ -18,7 +19,7 @@ object NonDeterministicPact : BeforeAllCallback, AfterAllCallback {
     val CUSTOM_OBJECT_MAPPER: ObjectMapper = Jackson2ObjectMapperBuilder().serializerByType(
         LocalDate::class.java,
         serializerAsDefault<LocalDate>("2023-01-01")
-    ).build()
+    ).serializationInclusion(JsonInclude.Include.NON_NULL).build()
 
 
     override fun beforeAll(context: ExtensionContext?) {
diff --git a/pact-jvm-mockk-spring/src/test/kotlin/io/github/ludorival/pactjvm/mockk/spring/contracts/ShoppingServiceContracts.kt b/pact-jvm-mockk-spring/src/test/kotlin/io/github/ludorival/pactjvm/mockk/spring/contracts/ShoppingServiceContracts.kt
index 20423b2..91247bc 100644
--- a/pact-jvm-mockk-spring/src/test/kotlin/io/github/ludorival/pactjvm/mockk/spring/contracts/ShoppingServiceContracts.kt
+++ b/pact-jvm-mockk-spring/src/test/kotlin/io/github/ludorival/pactjvm/mockk/spring/contracts/ShoppingServiceContracts.kt
@@ -7,6 +7,7 @@ import io.github.ludorival.pactjvm.mockk.spring.USER_ID
 import io.github.ludorival.pactjvm.mockk.spring.fakeapplication.infra.shoppingservice.ShoppingList
 import io.github.ludorival.pactjvm.mockk.willRespond
 import io.github.ludorival.pactjvm.mockk.willRespondWith
+import io.github.ludorival.pactjvm.mockk.Matcher
 import io.mockk.every
 import org.springframework.core.ParameterizedTypeReference
 import org.springframework.http.HttpHeaders
@@ -76,6 +77,12 @@ fun RestTemplate.willListTwoShoppingLists() = every {
     )
 } willRespondWith {
     description("list two shopping lists")
+    requestMatchingRules {
+        header("Authorization", Matcher(Matcher.MatchEnum.REGEX, "Bearer .*"))
+    }
+    responseMatchingRules {
+        body("[*].id", Matcher(Matcher.MatchEnum.TYPE))
+    }
     println(
         "I can have access to $args - $matcher - " +
             "$self - $nArgs -${firstArg<Any>()} - ${secondArg<Any>()} ${thirdArg<Any>()} ${lastArg<Any>()}"
diff --git a/pact-jvm-mockk-spring/src/test/resources/pacts-deterministic/shopping-list-shopping-service.json b/pact-jvm-mockk-spring/src/test/resources/pacts-deterministic/shopping-list-shopping-service.json
index 52fe1a9..35e8756 100644
--- a/pact-jvm-mockk-spring/src/test/resources/pacts-deterministic/shopping-list-shopping-service.json
+++ b/pact-jvm-mockk-spring/src/test/resources/pacts-deterministic/shopping-list-shopping-service.json
@@ -6,13 +6,10 @@
     "name" : "shopping-service"
   },
   "interactions" : [ {
-    "providerStates" : null,
     "description" : "POST /shopping-service/user/123? returns 200",
     "request" : {
       "method" : "POST",
       "path" : "/shopping-service/user/123",
-      "query" : null,
-      "headers" : null,
       "body" : {
         "title" : "My shopping list"
       }
@@ -29,7 +26,6 @@
       "headers" : { }
     }
   }, {
-    "providerStates" : null,
     "description" : "list two shopping lists",
     "request" : {
       "method" : "GET",
@@ -38,7 +34,14 @@
       "headers" : {
         "Content-Type" : "application/json"
       },
-      "body" : null
+      "matchingRules" : {
+        "header" : {
+          "Authorization" : {
+            "match" : "regex",
+            "regex" : "Bearer .*"
+          }
+        }
+      }
     },
     "response" : {
       "body" : [ {
@@ -71,49 +74,43 @@
         "createdAt" : "2023-01-01"
       } ],
       "status" : 200,
-      "headers" : { }
+      "headers" : { },
+      "matchingRules" : {
+        "body" : {
+          "[*].id" : {
+            "match" : "type"
+          }
+        }
+      }
     }
   }, {
-    "providerStates" : null,
     "description" : "delete shopping item",
     "request" : {
       "method" : "DELETE",
-      "path" : "/shopping-service/user/123/list/2",
-      "query" : null,
-      "headers" : null,
-      "body" : null
+      "path" : "/shopping-service/user/123/list/2"
     },
     "response" : {
-      "body" : null,
       "status" : 200,
       "headers" : { }
     }
   }, {
-    "providerStates" : null,
     "description" : "update shopping list",
     "request" : {
       "method" : "PUT",
       "path" : "/shopping-service/user/123/list/2",
-      "query" : null,
-      "headers" : null,
       "body" : {
         "name" : "My updated shopping list"
       }
     },
     "response" : {
-      "body" : null,
       "status" : 200,
       "headers" : { }
     }
   }, {
-    "providerStates" : null,
     "description" : "GET /shopping-service/user/123/list/1? returns 200",
     "request" : {
       "method" : "GET",
-      "path" : "/shopping-service/user/123/list/1",
-      "query" : null,
-      "headers" : null,
-      "body" : null
+      "path" : "/shopping-service/user/123/list/1"
     },
     "response" : {
       "body" : {
@@ -135,13 +132,10 @@
       "headers" : { }
     }
   }, {
-    "providerStates" : null,
     "description" : "Patch a shopping item",
     "request" : {
       "method" : "PATCH",
       "path" : "/shopping-service/user/123/list/1",
-      "query" : null,
-      "headers" : null,
       "body" : {
         "id" : 2,
         "name" : "Banana",
@@ -159,15 +153,12 @@
     }
   }, {
     "providerStates" : [ {
-      "name" : "The request should return a 400 Bad request",
-      "params" : null
+      "name" : "The request should return a 400 Bad request"
     } ],
     "description" : "should return a 400 Bad request",
     "request" : {
       "method" : "POST",
       "path" : "/shopping-service/user/123",
-      "query" : null,
-      "headers" : null,
       "body" : {
         "title" : "Unexpected character \\s"
       }
@@ -178,13 +169,10 @@
       "headers" : { }
     }
   }, {
-    "providerStates" : null,
     "description" : "create empty shopping list",
     "request" : {
       "method" : "POST",
       "path" : "/shopping-service/user/123",
-      "query" : null,
-      "headers" : null,
       "body" : {
         "title" : "My Shopping list"
       }
diff --git a/pact-jvm-mockk-spring/src/test/resources/pacts-deterministic/shopping-list-user-service.json b/pact-jvm-mockk-spring/src/test/resources/pacts-deterministic/shopping-list-user-service.json
index 7850af1..0c5c9ce 100644
--- a/pact-jvm-mockk-spring/src/test/resources/pacts-deterministic/shopping-list-user-service.json
+++ b/pact-jvm-mockk-spring/src/test/resources/pacts-deterministic/shopping-list-user-service.json
@@ -6,12 +6,10 @@
     "name" : "user-service"
   },
   "interactions" : [ {
-    "providerStates" : null,
     "description" : "PUT /user-service/v1/user/123? returns 200",
     "request" : {
       "method" : "PUT",
       "path" : "/user-service/v1/user/123",
-      "query" : null,
       "headers" : { },
       "body" : {
         "preferredShoppingListId" : 1
@@ -39,10 +37,7 @@
     "description" : "get the user profile",
     "request" : {
       "method" : "GET",
-      "path" : "/user-service/v1/user/123",
-      "query" : null,
-      "headers" : null,
-      "body" : null
+      "path" : "/user-service/v1/user/123"
     },
     "response" : {
       "body" : {
diff --git a/pact-jvm-mockk-spring/src/test/resources/pacts/shopping-list-shopping-service.json b/pact-jvm-mockk-spring/src/test/resources/pacts/shopping-list-shopping-service.json
index 52fe1a9..35e8756 100644
--- a/pact-jvm-mockk-spring/src/test/resources/pacts/shopping-list-shopping-service.json
+++ b/pact-jvm-mockk-spring/src/test/resources/pacts/shopping-list-shopping-service.json
@@ -6,13 +6,10 @@
     "name" : "shopping-service"
   },
   "interactions" : [ {
-    "providerStates" : null,
     "description" : "POST /shopping-service/user/123? returns 200",
     "request" : {
       "method" : "POST",
       "path" : "/shopping-service/user/123",
-      "query" : null,
-      "headers" : null,
       "body" : {
         "title" : "My shopping list"
       }
@@ -29,7 +26,6 @@
       "headers" : { }
     }
   }, {
-    "providerStates" : null,
     "description" : "list two shopping lists",
     "request" : {
       "method" : "GET",
@@ -38,7 +34,14 @@
       "headers" : {
         "Content-Type" : "application/json"
       },
-      "body" : null
+      "matchingRules" : {
+        "header" : {
+          "Authorization" : {
+            "match" : "regex",
+            "regex" : "Bearer .*"
+          }
+        }
+      }
     },
     "response" : {
       "body" : [ {
@@ -71,49 +74,43 @@
         "createdAt" : "2023-01-01"
       } ],
       "status" : 200,
-      "headers" : { }
+      "headers" : { },
+      "matchingRules" : {
+        "body" : {
+          "[*].id" : {
+            "match" : "type"
+          }
+        }
+      }
     }
   }, {
-    "providerStates" : null,
     "description" : "delete shopping item",
     "request" : {
       "method" : "DELETE",
-      "path" : "/shopping-service/user/123/list/2",
-      "query" : null,
-      "headers" : null,
-      "body" : null
+      "path" : "/shopping-service/user/123/list/2"
     },
     "response" : {
-      "body" : null,
       "status" : 200,
       "headers" : { }
     }
   }, {
-    "providerStates" : null,
     "description" : "update shopping list",
     "request" : {
       "method" : "PUT",
       "path" : "/shopping-service/user/123/list/2",
-      "query" : null,
-      "headers" : null,
       "body" : {
         "name" : "My updated shopping list"
       }
     },
     "response" : {
-      "body" : null,
       "status" : 200,
       "headers" : { }
     }
   }, {
-    "providerStates" : null,
     "description" : "GET /shopping-service/user/123/list/1? returns 200",
     "request" : {
       "method" : "GET",
-      "path" : "/shopping-service/user/123/list/1",
-      "query" : null,
-      "headers" : null,
-      "body" : null
+      "path" : "/shopping-service/user/123/list/1"
     },
     "response" : {
       "body" : {
@@ -135,13 +132,10 @@
       "headers" : { }
     }
   }, {
-    "providerStates" : null,
     "description" : "Patch a shopping item",
     "request" : {
       "method" : "PATCH",
       "path" : "/shopping-service/user/123/list/1",
-      "query" : null,
-      "headers" : null,
       "body" : {
         "id" : 2,
         "name" : "Banana",
@@ -159,15 +153,12 @@
     }
   }, {
     "providerStates" : [ {
-      "name" : "The request should return a 400 Bad request",
-      "params" : null
+      "name" : "The request should return a 400 Bad request"
     } ],
     "description" : "should return a 400 Bad request",
     "request" : {
       "method" : "POST",
       "path" : "/shopping-service/user/123",
-      "query" : null,
-      "headers" : null,
       "body" : {
         "title" : "Unexpected character \\s"
       }
@@ -178,13 +169,10 @@
       "headers" : { }
     }
   }, {
-    "providerStates" : null,
     "description" : "create empty shopping list",
     "request" : {
       "method" : "POST",
       "path" : "/shopping-service/user/123",
-      "query" : null,
-      "headers" : null,
       "body" : {
         "title" : "My Shopping list"
       }
diff --git a/pact-jvm-mockk-spring/src/test/resources/pacts/shopping-list-user-service.json b/pact-jvm-mockk-spring/src/test/resources/pacts/shopping-list-user-service.json
index 7850af1..0c5c9ce 100644
--- a/pact-jvm-mockk-spring/src/test/resources/pacts/shopping-list-user-service.json
+++ b/pact-jvm-mockk-spring/src/test/resources/pacts/shopping-list-user-service.json
@@ -6,12 +6,10 @@
     "name" : "user-service"
   },
   "interactions" : [ {
-    "providerStates" : null,
     "description" : "PUT /user-service/v1/user/123? returns 200",
     "request" : {
       "method" : "PUT",
       "path" : "/user-service/v1/user/123",
-      "query" : null,
       "headers" : { },
       "body" : {
         "preferredShoppingListId" : 1
@@ -39,10 +37,7 @@
     "description" : "get the user profile",
     "request" : {
       "method" : "GET",
-      "path" : "/user-service/v1/user/123",
-      "query" : null,
-      "headers" : null,
-      "body" : null
+      "path" : "/user-service/v1/user/123"
     },
     "response" : {
       "body" : {