diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18c51f2b..a84777e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Added
 
 - New --partwipe flag for profile and node set
+- Updated arguments for `ValidString` to match `regexp.MatchString`
 
 ## v4.6.5, 2026-01-12
 
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index ddb558cc..94393a59 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -51,3 +51,4 @@
 - Adrian Reber <areber@redhat.com>
 - Karker Said <said.karker@gmail.com> [@kosmolito](https://github.com/kosmolito)
 - Jason Scott <jsco2t@outlook.com> @jsco2t
+- Sujeev Uthayakumar <sujeev.uthayakumar@gmail.com> [@Sujeev-Uthayakumar](https://github.com/Sujeev-Uthayakumar)
diff --git a/internal/pkg/image/util.go b/internal/pkg/image/util.go
index 6519a457..f5cd6e5e 100644
--- a/internal/pkg/image/util.go
+++ b/internal/pkg/image/util.go
@@ -12,7 +12,7 @@ import (
 )
 
 func ValidName(name string) bool {
-	if !util.ValidString(name, "^[\\w\\-\\.\\:]+$") {
+	if !util.ValidString("^[\\w\\-\\.\\:]+$", name) {
 		wwlog.Warn("Image name has illegal characters: %s", name)
 		return false
 	}
diff --git a/internal/pkg/overlay/overlay.go b/internal/pkg/overlay/overlay.go
index 79342ea9..516ee44f 100644
--- a/internal/pkg/overlay/overlay.go
+++ b/internal/pkg/overlay/overlay.go
@@ -961,7 +961,7 @@ func BuildOverlayIndir(nodeData node.Node, allNodes []node.Node, overlayNames []
 		return fmt.Errorf("output must a be a directory: %s", outputDir)
 	}
 
-	if !util.ValidString(strings.Join(overlayNames, ""), "^[a-zA-Z0-9-._:]+$") {
+	if !util.ValidString("^[a-zA-Z0-9-._:]+$", strings.Join(overlayNames, "")) {
 		return fmt.Errorf("overlay names contains illegal characters: %v", overlayNames)
 	}
 
diff --git a/internal/pkg/upgrade/util.go b/internal/pkg/upgrade/util.go
index 188db6e1..5bae07a9 100644
--- a/internal/pkg/upgrade/util.go
+++ b/internal/pkg/upgrade/util.go
@@ -27,7 +27,7 @@ func legacyKernelVersionFile(kernelName string) string {
 		return ""
 	}
 
-	if !util.ValidString(kernelName, "^[a-zA-Z0-9-._]+$") {
+	if !util.ValidString("^[a-zA-Z0-9-._]+$", kernelName) {
 		return ""
 	}
 
diff --git a/internal/pkg/util/util.go b/internal/pkg/util/util.go
index de6945a2..a999c195 100644
--- a/internal/pkg/util/util.go
+++ b/internal/pkg/util/util.go
@@ -129,8 +129,8 @@ func ReadFile(path string) ([]string, error) {
 	return lines, nil
 }
 
-func ValidString(pattern string, expr string) bool {
-	if b, _ := regexp.MatchString(expr, pattern); b {
+func ValidString(pattern string, s string) bool {
+	if b, _ := regexp.MatchString(pattern, s); b {
 		return true
 	}
 	return false