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refering to a long pattern by a variable


hello
i wish if i could refer to a long pattren by just a variable,
suppose the:
txt="abcbacabzzcz";
and the pattern to search is "b"~~___~~"c"
StringCases[txt, ShortestMatch["b" ~~ ___ ~~ "c"], Overlaps -> False]
Out[]={bc, bac, bzzc}
ok, i hope there is a way to supply just the :
pat=Characters["bc"];
and some procedure will make the "b" ~~ ___ ~~ "c" from the above pat variable 
and assign this pattern to pat2 variable so we just write:
StringCases[txt, 
ShortestMatch[pat2], Overlaps -> False]
to give the output 
Out[]={bc, bac, bzzc}
i have tried it by StringJoin but it does not work.
thanks



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