regex - Grepping for a pattern followed by another pattern and excluding what lies inbetween as ouput -

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i want 

egrep -o '(mon|tues)[1-3]?[0-9].*(mon|tues)[1-3]?[0-9]'

and isn't found (mon|tues)[1-3]?[0-9]

with input

mon19hellotues20 mon19world hellomon19 tues8worldtues22

i want

mon19tues20 tues8tues22

as output

sed better tool print matched txt in output:

sed -ne 's/(mon|tues)([1-3]{0,1}[0-9]).*(mon|tues)([1-3]{0,1}[0-9])/\1\2\3\4/p' file  mon19tues20 tues8tues22

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