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Extract the application name with version from an RPM string like
hpsmh-1.1.1.2-0-RHEL3-Linux.RPM, i require to extract hpsmh-1.1.1.2-0
from above string. Sometimes the RPM string may be hpsmh-1.1.1.2-RHEL3-
Linux.RPM.

On Wed, 11 Jul 2007 03:40:06 +0000, hari.siri74 wrote:

> Extract the application name with version from an RPM string like
> hpsmh-1.1.1.2-0-RHEL3-Linux.RPM, i require to extract hpsmh-1.1.1.2-0
> from above string. Sometimes the RPM string may be hpsmh-1.1.1.2-RHEL3-
> Linux.RPM.

Thank you for sharing.

The answer to your problem is here:
http://tinyurl.com/anel


--
Steven.

On Jul 11, 1:40 pm, hari.sir...@gmail.com wrote:
> Extract the application name with version from an RPM string like
> hpsmh-1.1.1.2-0-RHEL3-Linux.RPM, i require to extract hpsmh-1.1.1.2-0
> from above string. Sometimes the RPM string may be hpsmh-1.1.1.2-RHEL3-
> Linux.RPM.

Now that list-like splicing and indexing works on strings, why not
just splice the string, using .index to locate '-RHEL'?

wrote:
> Extract the application name with version from an RPM string like
> hpsmh-1.1.1.2-0-RHEL3-Linux.RPM, i require to extract hpsmh-1.1.1.2-0
> from above string. Sometimes the RPM string may be hpsmh-1.1.1.2-RHEL3-
> Linux.RPM.
>

Have a try with

import re
P=re.compile(r'(\w+(?:[-.]\d+)+)-RHEL3-Linux\.RPM')
S="hpsmh-1.1.1.2-0-RHEL3-Linux.RPM"
PO= P.match(S)
if PO :
print PO.group(1)



--
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

Helmut Jarausch wrote:
> wrote:
>> Extract the application name with version from an RPM string like
>> hpsmh-1.1.1.2-0-RHEL3-Linux.RPM, i require to extract hpsmh-1.1.1.2-0
>> from above string. Sometimes the RPM string may be hpsmh-1.1.1.2-RHEL3-
>> Linux.RPM.
>>
>
> Have a try with
>
> import re
> P=re.compile(r'(\w+(?:[-.]\d+)+)-RHEL3-Linux\.RPM')
> S="hpsmh-1.1.1.2-0-RHEL3-Linux.RPM"
> PO= P.match(S)
> if PO :
> print PO.group(1)


A slightly more generic match in case your package names turn out to be less consistent than given in the test cases:

#!/usr/bin/python

import re
pattern = re.compile(r'(\w+?-(\d+[\.-])+\d+?)-\D+.*RPM')
pkgnames = ["hpsmh-1.1.1.2-0-RHEL3-Linux.RPM", "hpsmh-1.1.1.2-RHEL3-Linux.RPM"]
for pkg in pkgnames:
matchObj = pattern.search(pkg)
if matchObj:
print matchObj.group(1)

Still assumes it will end in RPM (all caps), but if you add the flag "re.I" to the re.compile() call, it will match case-insensitive.

Hope that helps,

-Jay

wrote:
>> A slightly more generic match in case your package names turn out to be less consistent than given in the test cases:
>>
>> #!/usr/bin/python
>>
>> import re
>> pattern = re.compile(r'(\w+?-(\d+[\.-])+\d+?)-\D+.*RPM')
>> pkgnames = ["hpsmh-1.1.1.2-0-RHEL3-Linux.RPM", "hpsmh-1.1.1.2-RHEL3-Linux.RPM"]
>> for pkg in pkgnames:
>> matchObj = pattern.search(pkg)
>> if matchObj:
>> print matchObj.group(1)
>>
>> Still assumes it will end in RPM (all caps), but if you add the flag "re.I" to the re.compile() call, it will match case-insensitive.
>>
>> Hope that helps,
>>
>> -Jay
>
> How about if i had something like 1-3 words in the application name:
> websphere-pk543-1.1.4.2-1-RHEL3-i386.rpm (in this case are 2 words)?

Try this instead then:

#!/usr/bin/python

import re
pattern = re.compile(r'((\w+?-)+?(\d+[\.-])+\d+?)-\D+.*RPM', re.I)
pkgnames = ["hpsmh-1.1.1.2-0-RHEL3-Linux.RPM", "hpsmh-1.1.1.2-RHEL3-Linux.RPM", "websphere-pk543-1.1.4.2-1-RHEL3-i386.rpm"]
for pkg in pkgnames:
matchObj = pattern.search(pkg)
if matchObj:
print matchObj.group(1)

On Jul 11, 9:29 pm, Helmut Jarausch <jarau...@igpm.rwth-aachen.de>
wrote:
> import re
> P=re.compile(r'(\w+(?:[-.]\d+)+)-RHEL3-Linux\.RPM')
> S="hpsmh-1.1.1.2-0-RHEL3-Linux.RPM"
> PO= P.match(S)
> if PO :
> print PO.group(1)

Isn't a regexp overkill here when this will do:

head = filename[:filename.index('-RHEL3')]

Of course if you need to make it more generic (as in Jay's solution
below), re is the way to go.