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/^(a+)(b+)(c+)$(?(?{length($1) == length($2) && length($2) == length($
+3)})|(*FAIL))/;

/^(a+)(b+)(c+)$/ && length($1) == length($2) && length($2) == length($
+3);

/^([0-9]+)$(?(?{sqrt($1) == int sqrt($1)})|(*FAIL))/;

/^(.*)$(?(?{is_whatever($1)})|(*FAIL))/;