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<?php $a = 'something/rel/123/something'; var_dump(preg_replace('#(?<=rel/)(\d+)(?=/)#', 'current', $a));
based on MgfTc

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for Typed properties v2
string(31) "something/rel/current/something"
Output for Lexical anon
string(31) "something/rel/current/something"

Archived branches

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