How to print all lines that has exactly 3 occurences of digit 4 using grep?

sivasai83 · January 30, 2007, 12:38am

I am able to find the pattern if it is for atleast 3 occurences but with exactly 3 occurences? Can anybody help me on this.

anbu23 · January 30, 2007, 1:00am

grep "^[^4]*4[^4]*4[^4]*4[^4]*$" file

aigles · January 30, 2007, 8:14am

Another syntax using egrep :

egrep '^([^4]*4[^4]*){2}$'

Jean-Pierre.

sivasai83 · January 31, 2007, 1:21am

Anbu and Pierre, thank u very much for ur reply...its working...