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Getting multiple matches from a string with PowerShell

Posted on 2014-04-03
Medium Priority
Last Modified: 2014-04-03
I have a bunch of log files that I'd like to parse through and pull string data out of, but the RegEx on this one is getting a little outside of my level of expertise.  I'm basically going to use code similar to that found here :
$input_path = 'c:\test\file.txt'
$regex = '' #Need help with this part
select-string -Path $input_path -Pattern $regex -AllMatches | % { $_.Matches } | % { $_.Value }

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What I really need help with is figuring out the RegEx for these log files.  Here is an example of what they look like:

<option value="954393">LASTNAME1, FIRSTNAME1 - &#x5b;lfirstname1&#x40;domain.com&#x5d;</option>

<option value="819613">LASTNAME2, FIRSTNAME2 - &#x5b;firstname2.lastname2&#x40;domain.com&#x5d;</option>

<option value="1151900">LASTNAME3, FIRSTNAME3 - &#x5b;firstname3.lastname3&#x40;domain.com&#x5d;</option>

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What I'm trying to match and pull out is the number inside the value="", the LASTNAME, FIRSTNAME and then I want the string between &#x5b; and &#x40; (which may or may not contain a single period in it).

Are there any RegEx experts out there that can assist?
Question by:Souladin
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LVL 35

Expert Comment

by:Dan Craciun
ID: 39976136
Try this:
$regex = "<option value=""(\d*)"">([\w ]*), ([\w ]*)- &#x5b;(.*)&#x40;"

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You'll find the number in $1, the lastname in $2, the firstname in $3 and the last string in $4.

LVL 35

Accepted Solution

Dan Craciun earned 2000 total points
ID: 39976178
BTW, if you want to see the values, you need to do it like this:
select-string -Path $input_path -Pattern $regex -AllMatches | % { $_.Matches.Groups } | % { $_.Value }

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It will output something like this:
<option value="954393">LASTNAME1, FIRSTNAME1 - &#x5b;lfirstname1&#x40;
<option value="819613">LASTNAME2, FIRSTNAME2 - &#x5b;firstname2.lastname2&#x40;
<option value="1151900">LASTNAME3, FIRSTNAME3 - &#x5b;firstname3.lastname3&#x40;

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Without groups you would only see the original strings.

Author Closing Comment

ID: 39976302
That was way less complicated than I thought it would be.  Looks like I need to take that regex refresher class again.  Thanks!
LVL 35

Expert Comment

by:Dan Craciun
ID: 39976311
Glad I could help!

You could read some answers and then answer a few questions here. Bet it would trump that introductory course :)

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