diff --git a/lib/ace/mode/lsl_highlight_rules.js b/lib/ace/mode/lsl_highlight_rules.js
index 9bfe4aae..e30513d9 100644
--- a/lib/ace/mode/lsl_highlight_rules.js
+++ b/lib/ace/mode/lsl_highlight_rules.js
@@ -308,7 +308,7 @@ function LSLHighlightRules() {
                 regex : "\\b[a-zA-Z_][a-zA-Z0-9_]*\\b"
             }, {
                 token : "support.function.user-defined.lsl",
-                regex : "(?:\w+\s+)?(\w+)?\s*(?=\(.*?\))"                   // apparently some bad esape?
+                regex : /\w+\s+\w+\s*(?=\(.*?\))/
             }, {
                 token : "keyword.operator.lsl",
                 regex : "\\+\\+|\\-\\-|<<|>>|&&?|\\|\\|?|\\^|~|[!%<>=*+\\-\\/]=?"