Errors Installing Composer on macOS (JIT compilation Failed)

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This is a known PHP 7.3 bug.

As a temporary fix, edit your php.ini file (in my case: vi /usr/local/etc/php/7.3/php.ini), disable PHP PCRE JIT compilation by changing:

;pcre.jit=1

to

pcre.jit=0

remove ; before text

Reference Click here