diff --git a/apps/frontend/src/composables/project-slug-suggestions.ts b/apps/frontend/src/composables/project-slug-suggestions.ts
index 4c0476864a..519dbb2480 100644
--- a/apps/frontend/src/composables/project-slug-suggestions.ts
+++ b/apps/frontend/src/composables/project-slug-suggestions.ts
@@ -5,8 +5,7 @@ import { type MaybeRefOrGetter, onScopeDispose, ref, toValue, watch } from 'vue'
 
 const STALE_TIME = 1000 * 60 * 5
 const CHECK_DEBOUNCE = 300
-const PROJECT_SLUG_UNSAFE_CHARS = /[^a-zA-Z0-9._-]/g
-const PROJECT_SLUG_REGEX = /^[a-zA-Z0-9._-]{3,64}$/
+const PROJECT_SLUG_REGEX = /^[a-z0-9._-]{3,64}$/
 
 interface ProjectSlugSuggestionOptions {
 	title: MaybeRefOrGetter<string>
@@ -19,13 +18,20 @@ export function generateUrlSlug(value: string) {
 	return value
 		.trim()
 		.toLowerCase()
-		.replaceAll(' ', '-')
-		.replaceAll(PROJECT_SLUG_UNSAFE_CHARS, '')
-		.replaceAll(/--+/gm, '-')
+		.replaceAll('+', '-plus')
+		.replaceAll(/[!"'`]/g, '')
+		.replaceAll(/[^a-z0-9._-]+/g, '-')
+		.replaceAll(/-+/g, '-')
+		.replaceAll(/^-+|-+$/g, '')
 }
 
 function isValidProjectSlug(value: string) {
-	return PROJECT_SLUG_REGEX.test(value)
+	return (
+		PROJECT_SLUG_REGEX.test(value) &&
+		!value.startsWith('-') &&
+		!value.endsWith('-') &&
+		!value.includes('--')
+	)
 }
 
 function generateProjectSlugSuggestions(title: string, username?: string | null) {
@@ -40,7 +46,7 @@ function generateProjectSlugSuggestions(title: string, username?: string | null)
 	const usernameSlug = username ? generateUrlSlug(username) : ''
 	let withUsername = ''
 
-	if (titleSlug && usernameSlug) {
+	if (titleSlug && usernameSlug && usernameSlug.length <= 62) {
 		const availableTitleLength = 64 - usernameSlug.length - 1
 		const truncatedTitle = titleSlug.slice(0, availableTitleLength).replace(/-+$/, '')
 		if (truncatedTitle) withUsername = `${truncatedTitle}-${usernameSlug}`