Allow newline in Extra Network activation text (#16428)

Author: w-e-w

javascript/extraNetworks.js

@@ -201,7 +201,7 @@ function setupExtraNetworks() {
     setupExtraNetworksForTab('img2img');
 }
 
-var re_extranet = /<([^:^>]+:[^:]+):[\d.]+>(.*)/;
+var re_extranet = /<([^:^>]+:[^:]+):[\d.]+>(.*)/s;
 var re_extranet_g = /<([^:^>]+:[^:]+):[\d.]+>/g;
 
 var re_extranet_neg = /\(([^:^>]+:[\d.]+)\)/;

modules/ui_extra_networks.py

@@ -177,10 +177,8 @@ def add_pages_to_demo(app):
     app.add_api_route("/sd_extra_networks/get-single-card", get_single_card, methods=["GET"])
 
 
-def quote_js(s):
-    s = s.replace('\\', '\\\\')
-    s = s.replace('"', '\\"')
-    return f'"{s}"'
+def quote_js(s: str):
+    return json.dumps(s, ensure_ascii=False)
 
 
 class ExtraNetworksPage: