Python Regex match string between specific string and end character

Question

I am building a file stripper to build a config report, and I have a very very long string as my base data. The following is a very small snippet of it, but it at least illustrates what I'm working with.

Snippet Example: DEFAULT_GATEWAY=192.168.88.1&DELVRY_AGGREGATION_INTERVAL0=1&DELVRY_AGGREGATION_INTERVAL1=1&DELVRY_SCHEDULE0=1&DELVRY_SNI0=192.168.88.158&DELVRY_USE_SSL_TLS1=0&

How would I go about matching the following:

between "DEFAULT_GATEWAY=" and "&"
between "DELVRY_AGGREGATION_INTERVAL0=" and "&"
between "DELVRY_AGGREGATION_INTERVAL1=" and "&"
between "DELVRY_SCHEDULE=" and "&"
between "DELVRY_SNI0=" and "&"
between "DELVRY_USE_SSL_TLS1=" and "&"

and building a dict with it like:

{"DEFAULT_GATEWAY":"192.168.88.1",
 "DELVRY_AGGREGATION_INTERVAL0":"1",
 "DELVRY_AGGREGATION_INTERVAL1":"1",
 "DELVRY_SCHEDULE0":"1",
 "DELVRY_SNI0":"0",
 "DELVRY_USE_SSL_TLS1":"0"}

?

Hai Vu · Accepted Answer · 2015-01-24 05:42:35Z

3

Here is a way to do it.

In [1]: input = 'DEFAULT_GATEWAY=192.168.88.1&DELVRY_AGGREGATION_INTERVAL0=1&DELVRY_AGGREGATION_INTERVAL1=1&DELVRY_SCHEDULE0=1&DELVRY_SNI0=192.168.88.158&DELVRY_USE_SSL_TLS1=0&'

In [2]: input.split('&')
Out[2]: 
['DEFAULT_GATEWAY=192.168.88.1',
 'DELVRY_AGGREGATION_INTERVAL0=1',
 'DELVRY_AGGREGATION_INTERVAL1=1',
 'DELVRY_SCHEDULE0=1',
 'DELVRY_SNI0=192.168.88.158',
 'DELVRY_USE_SSL_TLS1=0',
 '']

In [3]: [keyval.split('=') for keyval in input.split('&') if keyval]
Out[3]: 
[['DEFAULT_GATEWAY', '192.168.88.1'],
 ['DELVRY_AGGREGATION_INTERVAL0', '1'],
 ['DELVRY_AGGREGATION_INTERVAL1', '1'],
 ['DELVRY_SCHEDULE0', '1'],
 ['DELVRY_SNI0', '192.168.88.158'],
 ['DELVRY_USE_SSL_TLS1', '0']]

In [4]: dict(keyval.split('=') for keyval in input.split('&') if keyval)
Out[4]: 
{'DEFAULT_GATEWAY': '192.168.88.1',
 'DELVRY_AGGREGATION_INTERVAL0': '1',
 'DELVRY_AGGREGATION_INTERVAL1': '1',
 'DELVRY_SCHEDULE0': '1',
 'DELVRY_SNI0': '192.168.88.158',
 'DELVRY_USE_SSL_TLS1': '0'}

Notes

This is the input line
Split by & to get pairs of key-values. Note the last entry is empty
Split each entry by the equal sign while throwing away empty entries
Build a dictionary

Another Solution

In [8]: import urlparse

In [9]: urlparse.parse_qsl(input)
Out[9]: 
[('DEFAULT_GATEWAY', '192.168.88.1'),
 ('DELVRY_AGGREGATION_INTERVAL0', '1'),
 ('DELVRY_AGGREGATION_INTERVAL1', '1'),
 ('DELVRY_SCHEDULE0', '1'),
 ('DELVRY_SNI0', '192.168.88.158'),
 ('DELVRY_USE_SSL_TLS1', '0')]

In [10]: dict(urlparse.parse_qsl(input))
Out[10]: 
{'DEFAULT_GATEWAY': '192.168.88.1',
 'DELVRY_AGGREGATION_INTERVAL0': '1',
 'DELVRY_AGGREGATION_INTERVAL1': '1',
 'DELVRY_SCHEDULE0': '1',
 'DELVRY_SNI0': '192.168.88.158',
 'DELVRY_USE_SSL_TLS1': '0'}

edited Jan 24, 2015 at 5:42

answered Jan 24, 2015 at 5:33

Hai Vu

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3 Comments

Eithos Over a year ago

Beat me to it... Good one. I saw this question late and I was almost done writing this exact solution.

Hai Vu Over a year ago

I am lucky this time. Usually, I am pretty late to the game

oorahduc Over a year ago

Perfect and elegant solution. Thanks! This not only gave me the specific key value pairs I wanted, but the entirety of pairs in the config for ease of use.

Jared · Accepted Answer · 2015-01-24 05:34:10Z

0

Split first by '&' to get a list of strings, then by '=', like this:

d = dict(kv.split('=') for kv in line.split('&'))

answered Jan 24, 2015 at 5:34

Jared

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4 Comments

Amit Over a year ago

You are missing one check for empty entries.

Jared Over a year ago

He just posted a snippet, it's not clear if empty entries are actually possible.

Amit Over a year ago

Look at other answers, it is certainly possible. All you are missing is if kv.

Jared Over a year ago

Just because he added the check doesn't mean it's possible, the only empty entry is the trailing one, which might just be because it's a snippet.

Alex Martelli · Accepted Answer · 2015-01-24 05:34:44Z

0

import re

keys = {"DEFAULT_GATEWAY",
    "DELVRY_AGGREGATION_INTERVAL0",
    "DELVRY_AGGREGATION_INTERVAL1",
    "DELVRY_SCHEDULE0",
    "DELVRY_SNI0",
    "DELVRY_USE_SSL_TLS1"}
resdict = {}
for k in keys:
    pat = '{}([^&])&'.format(k)
    mo = re.search(pat, bigstring)
    if mo is None: continue  # no match
    resdict[k] = mo.group(1)

will leave your desired result in resdict, if bigstring is the string you're searching in.

This assumes you know in advance which keys you'll be looking for, and you keep them in a set keys. If you don't know in advance the keys of interest, that's a very different issue of course.

answered Jan 24, 2015 at 5:34

Alex Martelli

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