You might need to click "Search instead for" to trigger the 'correct' search.

It's also odd how:

<script[ \\to[^<](?:(?!<\\/script>)<[^<])<\\/script[ \\t]?>

runs in <0.5 seconds, whilst:

<script[ \\t]?\\b[^<](?:(?!<\\/script>)<[^<])<\\/script[ \\t]?>

runs in >2.5 seconds?