It looks like TrimStart considers argument as a set of characters and removes
any of those characters from the start of the string.
Here's one option to remove a string prefix:
$a = '0-24.254.16.172.in-addr.arpa'
$prefix = "0-24."
if ($a.StartsWith($prefix)) { $a = $a.Substring($prefix.Length) }
Or you could use something with IndexOf to find the position of the first ".":
$a = $a.Substring($a.IndexOf(".")+1)
Edward
From: [email protected] [mailto:[email protected]] On
Behalf Of Mote, Todd
Sent: Tuesday, October 04, 2016 11:22 AM
To: [email protected]
Subject: [scripting] powershell trimstart?
Stumbled across this in the last couple of days, can anybody tell me what's
going on?
I have a string: '0-24.254.16.172.in-addr.arpa'
I need to remove the '0-24.' From the front so I thought, trimstart would get
me what I needed, however
('0-24.254.16.172.in-addr.arpa').trimstart('0-24.') returns
54.16.172.in-addr.arpa
If I take out the dot and run
('0-24.254.16.172.in-addr.arpa').trimstart('0-24') it returns
.254.16.172.in-addr.arpa
I know I could use substring to get the results I need, or even 2 trimstarts,
('0-24.254.16.172.in-addr.arpa').trimstart('0-24').trimstart('.')
, but why does it trim the '2' when I have the dot in there and trims what it's
told when it's not? what's special about a dot inside a string? I've seen the
same behavior with front slash "/". Double vs single quotes doesn't seem to
matter. I also thought maybe it needs to be escaped, but putting a backtick in
doesn't change the outcome either. Any ideas?
Todd
