[WJ-1291] Fix unsanitized javascript in anchors #28
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The check for prohibiting dangerous schemes, like
javascript:, could be bypassed by adding whitespace. Browsers would ignore the whitespace, but it would not match the verbatim dangerous scheme check. This PR patches this issue by adding a check that looks to see if there are weird characters (non-alphanumeric/underscore/dash) before the colon, which would indicate the input is potentially troublesome. In this case, it is rejected as a dangerous URL.