diff --git a/ui/src/components/application/ApplicationForm.vue b/ui/src/components/application/ApplicationForm.vue
index 68fb35d..e9cd4f0 100644
--- a/ui/src/components/application/ApplicationForm.vue
+++ b/ui/src/components/application/ApplicationForm.vue
@@ -18,6 +18,10 @@ import * as z from 'zod';
 import DateInput from '../form/DateInput.vue';
 import { ApplicationData } from '@/api/application';
 
+const regexA = /^https?:\/\/steamcommunity\.com\/id\/[A-Za-z0-9_]+\/?$/;
+const regexB = /^https?:\/\/steamcommunity\.com\/profiles\/\d+\/?$/;
+
+
 const formSchema = toTypedSchema(z.object({
   dob: z.string().refine(v => v, { message: "A date of birth is required." }),
   name: z.string().nonempty(),
@@ -28,7 +32,7 @@ const formSchema = toTypedSchema(z.object({
   joinReason: z.string().nonempty(),
   milsimAttraction: z.string().nonempty(),
   referral: z.string().nonempty(),
-  steamProfile: z.string().nonempty(),
+  steamProfile: z.string().nonempty().refine((val) => regexA.test(val) || regexB.test(val), { message: "Invalid Steam profile URL." }),
   timezone: z.string().nonempty(),
   canAttendSaturday: z.boolean(),
   interests: z.string().nonempty(),