Parenthesis causing filter Error

[TomSmith27]

Expected and actual behavior

Steps to reproduce the problem

1. ... Type in the value (-1.2 into a filter box
2. Using the code var n = tree.fancytree('getTree').filterNodes(match);
   with match = "(-1.2" you recieve this error

Uncaught SyntaxError: Invalid regular expression: /(-1.1/: Unterminated group

I have fixed the problem locally but not sure what the intended behaviour was this is the "working" version