diff --git a/src/js/static-filtering-parser.js b/src/js/static-filtering-parser.js
index 3d8e82fd6..ee3318240 100644
--- a/src/js/static-filtering-parser.js
+++ b/src/js/static-filtering-parser.js
@@ -900,7 +900,7 @@ export class AstFilterParser {
         this.reGoodRegexToken = /[^\x01%0-9A-Za-z][%0-9A-Za-z]{7,}|[^\x01%0-9A-Za-z][%0-9A-Za-z]{1,6}[^\x01%0-9A-Za-z]/;
         this.reBadCSP = /(?:^|[;,])\s*report-(?:to|uri)\b/i;
         this.reBadPP = /(?:^|[;,])\s*report-to\b/i;
-        this.reNetOption = /^(~?)([13a-z_-]+)(=?)/;
+        this.reNetOption = /^(~?)([134a-z_-]+)(=?)/;
         this.reNoopOption = /^_+$/;
         this.netOptionValueParser = new ArgListParser(',');
         this.scriptletArgListParser = new ArgListParser(',');