problem running grep within system command in perl


system("nm -r *.o|grep -v '.o' |grep "T\|t\|U\|u" |cut -c 12-|sort|
uniq"); the problem is that if we match 1 or more strings in grep the
argument must be in quotes i.e T\|t\|U\|u must be withing quotes ...how
do i escape them so that the above works fine?

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