diff --git a/app/ts/components/Settings.tsx b/app/ts/components/Settings.tsx
index 08e7ec1..49347b7 100644
--- a/app/ts/components/Settings.tsx
+++ b/app/ts/components/Settings.tsx
@@ -35,7 +35,15 @@ export const SettingsModal = ({ display, appSettings }: { display: Signal<boolea
 	const allValidInputs = useComputed(() => submissionRelayEndpointInput.value.valid && simulationRelayEndpointInput.value.valid && priorityFeeInput.value.valid && blocksInFutureInput.value.valid)
 
 	// https://urlregex.com/
-	const matchUrl = (value: string) => value.match(/(https?:\/\/(?:www\.|(?!www))[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,}|www\.[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,}|https?:\/\/(?:www\.|(?!www))[a-zA-Z0-9]+\.[^\s]{2,}|www\.[a-zA-Z0-9]+\.[^\s]{2,})/g)
+	const uriMatcher = new RegExp(
+		'^https?' + // protocol
+		'((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|' + // domain name
+		'((\\d{1,3}\\.){3}\\d{1,3}))' + // OR IP (v4) address
+		'(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*' + // port and path
+		'(\\?[;&a-z\\d%_.~+=-]*)?' + // query string
+		'(\\#[-a-z\\d_]*)?$' // fragment locator
+	)
+	const matchUrl = (value: string) => value.match(uriMatcher)
 
 	function validateSimulationRelayEndpointInput(value: string) {
 		const matched = matchUrl(value)