bash - Extract number from first line of a file in linux -

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i have file has contents below 

spec.2.attrid=revision& spec.2.value=5& spec.3.attrid=num& spec.3.value=vs&

i using below command extract numbers first line. way efficient or guys think of alternate way ?

cat ticketspecdata | tr -d " " | tr -s "[:alpha:]" "~" | tr -d "[=.=]" | cut -d "~" -f2

using :

$ grep -om1 '[0-9]\+' file 2

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