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while(/(regex1)/gi || /(regex2)/gi || /(regex3)/gi)

while(<file>) {
    (/(regex1)/i || /(regex2)/i || /(regex3)/i) && f($1);
}

while(<file>) {
 #put a while around the regexes if there is multiple
...
    (/(regex3)/i && doSomethingForRegex3($1)) ) &&
    still_do_a_general_func_if_needed($1);
}