Installed @std/regexp 1.0.1 from JSR

This is a part of the Deno's bundle of standard libraries, so it should
be somewhat trustworthy. For now, it only includes the escaping function
which I actually need.

package.json

@@ -31,6 +31,7 @@
     "type": "module",
     "dependencies": {
         "@fortawesome/fontawesome-free": "^6.7.2",
+        "@std/regexp": "npm:@jsr/std__regexp@^1.0.1",
         "lz-string": "^1.5.0"
     }
 }