You could maybe use  /^\d+\..*?hello.*$/m

It means

use YAPE::Regex::Explain;
print YAPE::Regex::Explain->new(
qr/^(\d+\..*?hello.*)$/m
)->explain;
__END__
The regular expression:

(?m-isx:^(\d+\..*?hello.*)$)

matches as follows:

NODE                     EXPLANATION
----------------------------------------------------------------------
(?m-isx:                 group, but do not capture (with ^ and $
                         matching start and end of line) (case-
                         sensitive) (with . not matching \n)
                         (matching whitespace and # normally):
----------------------------------------------------------------------
  ^                        the beginning of a "line"
----------------------------------------------------------------------
  (                        group and capture to \1:
----------------------------------------------------------------------
    \d+                      digits (0-9) (1 or more times (matching
                             the most amount possible))
----------------------------------------------------------------------
    \.                       '.'
----------------------------------------------------------------------
    .*?                      any character except \n (0 or more times
                             (matching the least amount possible))
----------------------------------------------------------------------
    hello                    'hello'
----------------------------------------------------------------------
    .*                       any character except \n (0 or more times
                             (matching the most amount possible))
----------------------------------------------------------------------
  )                        end of \1
----------------------------------------------------------------------
  $                        before an optional \n, and the end of a
                           "line"
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------
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