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$ awk 'BEGIN{info="this is a test2012test!";gsub(/[0-9]+/,"||",info);print info}'
this is a test||test!

$ awk 'BEGIN{info="this is a test2012test!";print index(info,"11111")?"ok":"no found";}'
no found
$ awk 'BEGIN{info="this is a test2012test!";print index(info,"is")?"ok":"no found";}'
ok
$ awk 'BEGIN{info="this is a test2012test!";print index(info,"test")?"ok":"no found";}'
ok

$ awk 'BEGIN{info="this is a test2012test!";print match(info,/[0-9]+/)?"ok":"no found";}'
ok

$ awk 'BEGIN{info="this is a test2012test!";print substr(info,4,10);}'
s is a tes