[SunHELP] repost: egrep w/multiple criteria

How can I egrep for a process that contains both EXPR1 and
EXPR2.  Where EXPR1 "could" be /this and EXPR2 could be
test.  

For example:

> ps -aef | grep -v grep | egrep '/this&test'
luser  1640  1628  0   Jul 09 ?        1:18 /this/is/a/test

*the above syntax doesn't return anything.
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