diff --git a/codefresh/resource_pipeline.go b/codefresh/resource_pipeline.go
index 86f7af1..100b1b6 100644
--- a/codefresh/resource_pipeline.go
+++ b/codefresh/resource_pipeline.go
@@ -142,7 +142,7 @@ func resourcePipeline() *schema.Resource {
 										Type:         schema.TypeString,
 										Optional:     true,
 										Default:      "/.*/gi",
-										ValidateFunc: validation.StringIsValidRegExp,
+										ValidateFunc: stringIsValidRe2RegExp,
 									},
 									"branch_regex_input": {
 										Type:         schema.TypeString,
@@ -153,13 +153,13 @@ func resourcePipeline() *schema.Resource {
 									"pull_request_target_branch_regex": {
 										Type:         schema.TypeString,
 										Optional:     true,
-										ValidateFunc: validation.StringIsValidRegExp,
+										ValidateFunc: stringIsValidRe2RegExp,
 									},
 									"comment_regex": {
 										Type:         schema.TypeString,
 										Optional:     true,
 										Default:      "/.*/gi",
-										ValidateFunc: validation.StringIsValidRegExp,
+										ValidateFunc: stringIsValidRe2RegExp,
 									},
 									"modified_files_glob": {
 										Type:     schema.TypeString,
@@ -260,7 +260,7 @@ func resourcePipeline() *schema.Resource {
 												"branch_name": {
 													Type:          schema.TypeString,
 													Optional:      true,
-													ValidateFunc:  validation.StringIsValidRegExp,
+													ValidateFunc:  stringIsValidRe2RegExp,
 													ConflictsWith: []string{"spec.0.termination_policy.0.on_create_branch.0.ignore_branch"},
 												},
 												"ignore_trigger": {
diff --git a/codefresh/resource_pipeline_test.go b/codefresh/resource_pipeline_test.go
index a08ca82..0229710 100644
--- a/codefresh/resource_pipeline_test.go
+++ b/codefresh/resource_pipeline_test.go
@@ -206,10 +206,10 @@ func TestAccCodefreshPipeline_Triggers(t *testing.T) {
 					"master",
 					"git",
 					"commits",
-					"/master/gi",
+					"/^(?!(master)$).*/gi",
 					"multiselect",
-					"/master/gi",
-					"/PR comment/gi",
+					"/^(?!(master)$).*/gi",
+					"/^PR comment$/gi",
 					"shared_context1",
 					"git",
 					"push.heads",
@@ -226,10 +226,10 @@ func TestAccCodefreshPipeline_Triggers(t *testing.T) {
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckCodefreshPipelineExists(resourceName),
 					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.#", "2"),
-					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.0.branch_regex", "/master/gi"),
+					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.0.branch_regex", "/^(?!(master)$).*/gi"),
 					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.0.branch_regex_input", "multiselect"),
-					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.0.pull_request_target_branch_regex", "/master/gi"),
-					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.0.comment_regex", "/PR comment/gi"),
+					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.0.pull_request_target_branch_regex", "/^(?!(master)$).*/gi"),
+					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.0.comment_regex", "/^PR comment$/gi"),
 					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.0.name", "commits"),
 					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.1.name", "tags"),
 					resource.TestCheckResourceAttr(resourceName, "spec.0.trigger.1.contexts.0", "shared_context2"),
diff --git a/codefresh/utils.go b/codefresh/utils.go
index bd75e77..91c2094 100644
--- a/codefresh/utils.go
+++ b/codefresh/utils.go
@@ -6,6 +6,7 @@ import (
 	"regexp"
 
 	cfClient "github.com/codefresh-io/terraform-provider-codefresh/client"
+	"github.com/dlclark/regexp2"
 	"github.com/ghodss/yaml"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
 )
@@ -97,3 +98,21 @@ func suppressEquivalentYamlDiffs(k, old, new string, d *schema.ResourceData) boo
 
 	return normalizedOld == normalizedNew
 }
+
+// This function has the same structure of StringIsValidRegExp from the terraform plugin SDK
+// https://github.com/hashicorp/terraform-plugin-sdk/blob/695f0c7b92e26444786b8963e00c665f1b4ef400/helper/validation/strings.go#L225
+// It has been modified to use the library https://github.com/dlclark/regexp2 instead of the standard regex golang package
+// in order to support complex regular expressions including perl regex syntax
+func stringIsValidRe2RegExp(i interface{}, k string) (warnings []string, errors []error) {
+	v, ok := i.(string)
+	if !ok {
+		errors = append(errors, fmt.Errorf("expected type of %s to be string", k))
+		return warnings, errors
+	}
+
+	if _, err := regexp2.Compile(v, regexp2.RE2); err != nil {
+		errors = append(errors, fmt.Errorf("%q: %s", k, err))
+	}
+
+	return warnings, errors
+}
diff --git a/go.mod b/go.mod
index d3f90f2..d243ede 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,7 @@ require (
 	github.com/bflad/tfproviderdocs v0.6.0
 	github.com/bflad/tfproviderlint v0.14.0
 	github.com/client9/misspell v0.3.4
+	github.com/dlclark/regexp2 v1.4.0
 	github.com/ghodss/yaml v1.0.0
 	github.com/golangci/golangci-lint v1.27.0
 	github.com/hashicorp/terraform-config-inspect v0.0.0-20191212124732-c6ae6269b9d7 // indirect
diff --git a/go.sum b/go.sum
index 030134c..1f23cf9 100644
--- a/go.sum
+++ b/go.sum
@@ -74,6 +74,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
+github.com/dlclark/regexp2 v1.4.0 h1:F1rxgk7p4uKjwIQxBs9oAXe5CqrXlCduYEJvrF4u93E=
+github.com/dlclark/regexp2 v1.4.0/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=