This may not be the 'cleanest' solution, but it requires very little change to existing code. (Assumes that both regexes cannot match the same $sFunction. But I think that is implied by 'switch'.)

for ( $sFunction ) {
    (/test1/ || /test2/) && do {
        # ....
    };
    /test2/ && do {
        # ....
    };
}
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Sorry, Same as LanX's first solution. Comments apply.