From 1218a0c229a873645853dfb1aea6479df3b60d96 Mon Sep 17 00:00:00 2001
From: Marcin Trojanowski <marcin.trojanowski@selector.ai>
Date: Mon, 21 Aug 2023 17:20:15 +0200
Subject: [PATCH] regex support flag in replacement transformer

Signed-off-by: Marcin Trojanowski <marcin.trojanowski@selector.ai>
---
 api/filters/replacement/replacement.go      |  2 +-
 api/filters/replacement/replacement_test.go | 84 +++++++++++++++++++++
 api/types/replacement.go                    |  3 +
 3 files changed, 88 insertions(+), 1 deletion(-)

diff --git a/api/filters/replacement/replacement.go b/api/filters/replacement/replacement.go
index bea5690c404..06c82b13734 100644
--- a/api/filters/replacement/replacement.go
+++ b/api/filters/replacement/replacement.go
@@ -198,7 +198,7 @@ func copyValueToTarget(target *yaml.RNode, value *yaml.RNode, selector *types.Ta
 		if err != nil {
 			return errors.WrapPrefixf(err, fieldRetrievalError(fp, createKind != 0))
 		}
-		if len(targetFields) == 0 {
+		if len(targetFields) == 0 && !selector.Options.RegexFindMode {
 			return errors.Errorf(fieldRetrievalError(fp, createKind != 0))
 		}
 
diff --git a/api/filters/replacement/replacement_test.go b/api/filters/replacement/replacement_test.go
index 7619e5fc9d3..3d220fd98fb 100644
--- a/api/filters/replacement/replacement_test.go
+++ b/api/filters/replacement/replacement_test.go
@@ -19,6 +19,90 @@ func TestFilter(t *testing.T) {
 		expected     string
 		expectedErr  string
 	}{
+		"regexsimpleempty": {
+			input: `apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: postgres:1.8.0
+        name: postgresdb
+`,
+			replacements: `replacements:
+- source:
+    kind: Deployment
+    name: deploy
+    fieldPath: spec.template.spec.containers.0.image
+  targets:
+  - select:
+      kind: Deployment
+      name: deploy
+    options:
+      regexfindmode: true
+    fieldPaths:
+    - spec.template.spec.containers.[name=myservice-*].image
+`,
+			expected: `apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: postgres:1.8.0
+        name: postgresdb
+`,
+		},
+		"regexsimple": {
+			input: `apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: postgres:1.8.0
+        name: myservice-postgresdb
+`,
+			replacements: `replacements:
+- source:
+    kind: Deployment
+    name: deploy
+    fieldPath: spec.template.spec.containers.0.image
+  targets:
+  - select:
+      kind: Deployment
+      name: deploy
+    options:
+      regexfindmode: true
+    fieldPaths:
+    - spec.template.spec.containers.[name=myservice-*].image
+`,
+			expected: `apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: nginx:1.7.9
+        name: myservice-postgresdb
+`,
+		},
 		"simple": {
 			input: `apiVersion: v1
 kind: Deployment
diff --git a/api/types/replacement.go b/api/types/replacement.go
index cb4163429ad..9fcc17cce30 100644
--- a/api/types/replacement.go
+++ b/api/types/replacement.go
@@ -77,6 +77,9 @@ type FieldOptions struct {
 
 	// If field missing, add it.
 	Create bool `json:"create,omitempty" yaml:"create,omitempty"`
+
+	// Allows to Find Field values using regex primitives.
+	RegexFindMode bool `json:"regexfindmode,omitempty" yaml:"regexfindmode,omitempty"`
 }
 
 func (fo *FieldOptions) String() string {