Help for this page

Select Code to Download

Select or download this

1welcometo india.
^...............is matched and consumed by ([0-9]+)
 ^^^^^^^........is matched but not consumed by (?=welcome)
 ^..............so "to india" tries to match here and fails.

Select or download this

$str = '1welcometo india';;

$str =~ m/([0-9]+)(?=welcome)welcometo india/ and print 'matched';;
matched