Vista - Finding a regex position in a string

Hey again ;o)

Doing a script. Using a regex to find the various bits and pieces of each
line of text I run through. So I have
a regex for the time, the date, etc.

Question is, is there a property to the regex, kinda like $regex.ismatch
but perhaps $regex.position, that tells
me at which character in the string, the positive match begins ? That would
make life a lot easier for me, with
regards to getting the text out of the string

Best Regards,
Jacob

Check the Index and the Length properties

PS > [regex]::match("powershell rocks!","shell")


Groups : {shell}
Success : True
Captures : {shell}
Index : 5
Length : 5
Value : shell



-----
Shay Levi
$cript Fanatic
http://scriptolog.blogspot.com

Hello Shay,

thanks man, just what I needed


Best Regards,
Jacob Saaby Nielsen
mailto:jacob.saaby@xxxxxx
PS>> [regex]::match("powershell rocks!","shell")
PS>>

Hey Shay,

so I pass this string to my function:

[string]$testString = "2007-11-01 10:14:15 Local7.Notice 192.168.3.253 56382
11/01/2007 10:15:53.400 SEV=4 AUTH/22 RPT=1784 User [domain\user] Group
[group] connected, Session Type: IPSec"

And this is my function:

function getTime ([string]$UserTime)
{
# Look for time in a string
# Regular Expression: \d{2}[:]\d{2}[:]\d{2}

$Regex = [regex]"\d{2}[:]\d{2}[:]\d{2}"

Write-Host $Regex($UserTime).Value

}

That just writes the contents of $regex. Originally I did

Write-Host $Regex.Value($UserTime)

That gave me an error, that Value isn't a property that exists.

Can anyone help me out here, and point me in the right direction ? I need
to use the regex pattern to find
whatever I need in the string, then be able to at least get the index of
the match. Preferably the length also,
and it would be way cool to get the Value of the regex match straight away.

So if you got the knowledge everyone, share it ! (Please )

Best Regards,
Jacob Saaby Nielsen
mailto:jacob.saaby@xxxxxx
PS>> [regex]::match("powershell rocks!","shell")
PS>>

I changed your code a bit to perform named group lookups:

[string]$testString = "2007-11-01 10:14:15 Local7.Notice 192.168.3.253 56382
11/01/2007 10:15:53.400 SEV=4 AUTH/22 RPT=1784 User [domain\user] Group [group]
connected, Session Type: IPSec"
$Regex = [regex]'(?<userTime>\d{2}:\d{2}:\d{2})'
$Regex.matches($testString)

Groups : {10:14:15, 10:14:15}
Success : True
Captures : {10:14:15}
Index : 11
Length : 8
Value : 10:14:15

Groups : {10:15:53, 10:15:53}
Success : True
Captures : {10:15:53}
Index : 65
Length : 8
Value : 10:15:53



Now you can get the matches by pointing to the group name:


PS > $Regex.matches($testString) | foreach {$_.groups['userTime'].value}
10:14:15
10:15:53

PS > $Regex.matches($testString) | foreach {$_.groups['userTime'].Index}
11
65


There is also a built-in help file for regular exprresions in PowerShell:

PS > help about_regular_expression


Some more resources:

Keith Hill's blog
Effective PowerShell Item 9: Regular Expressions - One of the Power Tools
in PowerShell
http://keithhill.spaces.live.com/Blo...3A97!820.entry


The 30 Minute Regex Tutorial
http://www.codeproject.com/dotnet/RegexTutorial.asp


Windows PowerShell: The Definitive Guide Guide
Appendix B. Regular Expression Reference
http://safari.oreilly.com/9780596528...sion_reference


-----
Shay Levi
$cript Fanatic
http://scriptolog.blogspot.com


PS>>> [regex]::match("powershell rocks!","shell")
PS>>>

On Nov 26, 5:01 pm, Jacob Saaby Nielsen <jacob.sa...@xxxxxx>
wrote:Jacob,

You need to work with a Match object to get what you need:

$match = $Regex.Match( $UserTime )

# the following properties get you the index and length,
# but you can use the Value property if you just need
# the value of the matched text

# Write-Host $match.Index
# Write-Host $match.Length

Write-Host $match.Value

I hope this helps.

Jeff

Hey Jeff and Shay,

awesome both of you ! Thanks a lot, appreciate it

Best Regards,
Jacob Saaby Nielsen
mailto:jacob.saaby@xxxxxx

Hey Jeff,

I ended up using the code you pointed out, and blogged it right here:

http://www.pipforhelvede.net/post/20...ing-%3bo).aspx

Best Regards,
Jacob Saaby Nielsen
mailto:jacob.saaby@xxxxxx