使用正则表达式很简单:

This is simple to do with a regex:

 ('jsmit123456') -replace '\D+(\d+)','$1'

 123456

\D+ = 所有非数字，\d+ = 后面的所有数字.

\D+ = all the non-digits, \d+ = all the digits that follow.

 $studentid = $object.SAMAccountName -replace '\D+(\d+)','$1'