Extracting Version Number from a String

Extracting Version Number from a String - Printable Version

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Extracting Version Number from a String - britesc - Apr-03-2023

Hi,
I would like to be able to extract the version number (nimbers and ,) from a string.
I can get the result but only if I use 1 type of delimeter
I have noticed that sometimes the delimeter changes so would like to have multiple delimeters options.
For example

import re
text = 'mawk/kinetic,now 1.3.4.20200120-3.1 amd64 [installed,automatic]'
m = re.search(',now (.+?)-', text)

print(m)

Output:
<re.Match object; span=(12, 32), match=',now 1.3.4.20200120-'>

print(m.group(0)

Output:
,now 1.3.4.20200120-

print(m.group(1))

Output:
1.3.4.20200120

In this case m.group(0) contains the answer I need as the delimiter was - but sometimes it can be a + or : as the final delimeter
Equally the first delimeter might be ,now 1:

For info the string is generated by apt list --installed | grep -i mawk (in this case)

So I am getting in a bit of a pickle as I know I should be able to have multiple start delimeters and multiple end delimters,
I assume there must be a simpler way of doing this rather than a series of if statements searching to see what is the start and end delimeter in a string and then calling the correct re.search code.
Regex is really powerfull and a language unto itself but I've not got much spare capacity in my onbaord mental ROM anymore.
Any advice gratefully received.
Thanks and kind regards,
jB Cool

RE: Extracting Version Number from a String - ibreeden - Apr-05-2023

(Apr-03-2023, 05:45 PM)britesc Wrote: In this case m.group(0) contains the answer I need as the delimiter was - but sometimes it can be a + or : as the final delimeter

Then you should use:

m = re.search(',now (.+?)[-+:]', text)

Does that give the results you need?

RE: Extracting Version Number from a String - britesc - May-31-2023

Sorry for the delayed response. Not very well.
I have managed to use your code with a bit extra to achieve what I required.
Thank you very much. Cool