Python search for value in string

Question

I have a string like this:

STAT bytes 0
STAT curr_items 0
STAT total_items 0
STAT evictions 0
STAT reclaimed 0
END

I'm trying to get the value of curr_items, so far I've got

out = telnet.read_until("END")
req = re.search("curr_items", out).group(0).split()[0]

Which returns curr_items, how do I get the value?

Thanks

What value to yo expect to get?

Adam Matan
– Adam Matan

2010-12-09 10:05:12 +00:00
Commented Dec 9, 2010 at 10:05 — Adam Matan
– Adam Matan, Commented Dec 9, 2010 at 10:05

Frédéric Hamidi · Accepted Answer · 2010-12-09 10:05:20Z

6

You can add a capture group matching the value to your regex:

>>> int(re.search("curr_items (\d+)", out).group(1))
0

answered Dec 9, 2010 at 10:05

Frédéric Hamidi

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3 Comments

Tom Over a year ago

Is this a better solution than the one submitted by khachik?

Frédéric Hamidi Over a year ago

@Tom, depends on what you mean by "better". My answer uses the regex to do all the work, so I can spare a call to split() and a list item access. @khachik's solution supports lines with no value (since he uses * instead of + in the regex) but his list access (.split()[1]) will fail in that case. Both solutions are good starting points, though :)

Tom Over a year ago

Better = best practice in python. Thanks for your detailed answer

khachik · Accepted Answer · 2010-12-09 10:05:30Z

1

re.search("curr_items [0-9]*", out).group(0).split()[1]

answered Dec 9, 2010 at 10:05

khachik

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Comments

Taras · Accepted Answer · 2010-12-09 10:30:42Z

1

try:
    req = int(re.search("(?<=curr_items)\s*([\d]*)", out).group(0))
except:
    # No value was found.
    req = defaultValue

edited Dec 9, 2010 at 10:30

answered Dec 9, 2010 at 10:24

Taras

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