Extracting sub string of a string in python regex

Question

I have a stream of structured strings. I want to extract 2 specific sections from each of them in Python language.

For example) my Strings are looking like these:

cpe:2.3:a:troglobit:uftpd:*:*:*:*:*:*:*:*

cpe:2.3:o:google:android:8.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:asp.net_core:2.1:*:*:*:*:*:*

I need the BOLD sections only.

Be aware that in the end the number of * is different in each case (it's between 6,7,8). Also, the strings could be started by cpe:2.3:o: or cpe:2.3:a:

I have tried different expressions such as these:

For example, this one works with cases that only have 6 * at the end.

try:
                        temp = re.search("cpe:2.3:a:(.*):\*:\*:\*:\*:\*:\*",testString).group(1)
except AttributeError:
                        temp = 'NOT FOUND'

Or

(Does not work)

try:
                        temp = re.search("(cpe:2.3:a:(.*)|cpe:2.3:o:)(.*)(:\*:\*:\*:\*:\*:\*:\*:\*|:\*:\*:\*:\*:\*:\*:\*|:\*:\*:\*:\*:\*:\*)", testString).group(1)
except AttributeError:
                        temp = 'NOT FOUND'

Or

(Does not work)

 try:    
                        temp = re.search("(cpe:2.3:a:(.*):(.*))':{0}'$", testString).group(1)
 except AttributeError:
                        temp = 'NOT FOUND'

Thank You.

all lines have cpe:2.3:a: or something like this always? I mean a 3 alphabet character then a : then a number, a dot, another number, another :, another character and another :? if yes check regex101.com/r/JKJ312/1 — Hamed Ghasempour
– Hamed Ghasempour, Commented Jan 23, 2020 at 20:18

Kenan · Accepted Answer · 2020-01-23 20:22:30Z

1

You can do it without a regex

sample = 'cpe:2.3:a:microsoft:asp.net_core:2.1:*:*:*:*:*:*'

' '.join(sample.split(':')[3:][:2])

'microsoft asp.net_core'

answered Jan 23, 2020 at 20:22

Kenan

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