regex - how to search pattern with numerals in vim -

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i want search patterns matching string part numerals.

example have file containing 

foo_1 foo_2 foo_3 foo_33 foo_34 foo_35 foo_65 foo_66 foo_67

and on , want search foo_2 , foo_34, foo_66 

/foo_[2|34|66]

this doesn't return me desired search. can here?

try /foo_\(2\|34\|66\)$.

see section 27.5 in vim details.


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