analog command grep -o in Powershell - powershell

Question

What command in Powershell replaces grep -o (which displays only the matched portion of a line instead of a whole line) ?
i try use Select-Object but it always display full line.
For example:
next line
<a id="tm_param1_text1_item_1" class="tm_param1param2_param3 xxx_zzz qqq_rrrr_www_vv_no_empty" >eeee <span id="ttt_xxx_zzz">0</span></a>
use next command:
cat filename | grep -o '>[0-9]' | grep -o '[0-9]'
output: 0
When i use Select-Object i always see full line (

Answer 1

One way is:
$a = '<a id="tm_param1_text1_item_1" class="tm_param1param2_param3 xxx_zzz qqq_rrrr_www_vv_no_empty" >eeee <span id="ttt_xxx_zzz">0</span></a>'
$a -match '>([0-9])<' #returns true and populate the $matches automatic variable
$matches[1] #returns 0

Answer 2

For selecting strings in text, use select-string rather than select-object. It will return a MatchInfo object. You can access the matches by querying the matches property:
$a = '<a id="tm_param1_text1_item_1" class="tm_param1param2_param3 xxx_zzz qqq_rrrr_www_vv_no_empty" >eeee <span id="ttt_xxx_zzz">0</span></a>'
($a | select-string '>[0-9]').matches[0].value # returns >0

Answer 3

InPowerShell v3:
sls .\filename -pattern '^[0-9]' -AllMatches | % matches | % value
Explanation:
sls is an alias for Select-String. It takes a filename/path as well as a pattern as parameters. It produces "matches"
% matches selects all matches regardless of file etc.
% value selects the value of each match

Answer 4

The solutions that have been proposed so far only produce the first match from each line. To fully emulate the behavior of grep -o (which produces every match from each line) something like this is required:
Get-Content filename | Select-String '>([0-9])' -AllMatches |
Select-Object -Expand Matches | % { $_.Groups[1].Value }
Select-String -AllMatches returns all matches from an input string.
Select-Object -Expand Matches "disconnects" matches from the same line, so that all submatches can be selected via $_.Groups[1]. Without this expansion the submatch from the second match of a line would be $_.Groups[3].