add this https://rdrama.net/h/countryclub/post/79285/-/5029126#context

files/helpers/regex.py

@@ -279,6 +279,8 @@ reddit_s_url_regex = re.compile("https:\/\/reddit.com\/[ru]\/\w{2,25}\/s\/\w{10}
 #run-time
 reddit_to_vreddit_regex = re.compile('(^|>|")https:\/\/old.reddit.com\/(r|user)\/', flags=re.A)
 
+#post search
+subreddit_name_regex = re.compile('\w{2,25}', flags=re.A)
 
 
 ###YOUTUBE

files/routes/search.py

@@ -22,6 +22,7 @@ valid_params = [
 	'title',
 	'sentto',
 	search_operator_hole,
+	'subreddit',
 ]
 
 def searchparse(text):
@@ -129,6 +130,15 @@ def searchposts(v):
 				)
 			)
 
+	if 'subreddit' in criteria:
+		subreddit = criteria['subreddit']
+
+		if not subreddit_name_regex.fullmatch(subreddit):
+			abort(400, "Invalid subreddit name.")
+
+		posts = posts.filter(Post.url.ilike(f"https://old.reddit.com/r/{subreddit}/%"))
+
+
 	if search_operator_hole in criteria:
 		posts = posts.filter(Post.sub == criteria[search_operator_hole])
 

files/templates/search.html

@@ -77,6 +77,10 @@
 										<div style="display: inline-block; width: 150px; text-align: center">Exact Match Only:</div>
 										<button type="button" data-nonce="{{g.nonce}}" data-onclick="addParam(this, 'bool')" class="searchparam mb-1">exact:true</button>
 									</div>
+									<div>
+										<div style="display: inline-block; width: 150px; text-align: center">Subreddit:</div>
+										<button type="button" data-nonce="{{g.nonce}}" data-onclick="addParam(this)" class="searchparam mb-1">subreddit:menslib</button>
+									</div>
 								{% endif %}
 								{% if FEATURES['NSFW_MARKING'] %}
 									<div>