replace with optional matching fails when there is no match (31456)
#40391
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vtjnash
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This is a resuscitation of #31493 (which I couldn't update easily). The context is #31456 , there's an error if an optional matching group is unset as can be seen in the contrived example below.
Before:
After
cc @vtjnash (it integrates the changes you suggested in #31493)