Bug in grep

[Joshua Trimm]

We have found a major bug in grep using regular expressions, all we are
doing is switching the com, net, org around in the 'or' statement and it
produces different results, as per the example, these 2 should NEVER
match com.br, yet the 2nd one does:

echo "com.br" | egrep '[a-z0-9]\.[com|net|org|mil|ca|info]+$'
echo "com.br" | egrep '[a-z0-9]\.[biz|org|net|info|com]+$'

Please let us know of any resolutions, thank you.