How about just /Ac|Ag|Al|Am.../. Let the regex compiler do the work for you, and keep it readable and maintainable.
(A true regular expression is compiled to a DFA, which is unique for the set of input strings matched, so there is nothing to gain performance-wise from factoring out common prefixes. That is quite literally the job of the compiler.)
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[ 2.7 ms ] story [ 10.9 ms ] thread(A true regular expression is compiled to a DFA, which is unique for the set of input strings matched, so there is nothing to gain performance-wise from factoring out common prefixes. That is quite literally the job of the compiler.)