Sam 3c678df942
PERF: avoid lookbehinds when indexing search (#10862)
* PERF: avoid lookbehinds when indexing search

Previously we used a `EmailCook.url_regexp` this regex used lookbehinds

Unfortunately certain strings could lead to pathological behavior causing
CPU to skyrocket and regex replace to take a very very long time.

EmailCook still needs a fix, but it is less urgent cause it already splits
to single lines. That said we will correct that as well in a seperate PR.

New implementation is far more naive and relies on the extra spaces search
indexer inserts.
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