regex - Regular expression not showing multiple line content -

i have file following format.

<hello> <random1> <random2> .... .... .... <random100> <bye> 

i want find whether bye , hello there, , bye below hello. tried regular expression.

grep "hello.*bye" filename

but fails match expected.

you use pcregrep:

pcregrep -m 'hello(\n|.)*bye' filename 

the -m option makes possible search patterns span line boundaries.

for input, it'd produce:

<hello> <random1> <random2> .... .... .... <random100> <bye>