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Fix mb_ereg_search_getregs() NULL pointer dereference #21038

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Fix mb_ereg_search_getregs() NULL pointer dereference #21038

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@vi3tL0u1s vi3tL0u1s commented Jan 25, 2026

Add NULL check for MBREX(search_re) before calling onig_number_of_names() in mb_ereg_search_getregs() to prevent crash when mb_eregi() invalidates the regex cache.

Fixes GH-21036

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