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Because it shown error

PCCG1[admin]# grep -f file1 file2
grep: Regular expression too big

Can done by script ? as the file are too big...

i want to compare two file and print same line


file1
12345 a
23456 a
45678 a
45679 a

file2
23456 a
34567 a
45679 a

output
23456 a
45679 a


any one can help me? Thank you