Extract string from between quotations
I want to extract information from user-inputted text. Imagine I input the following:
SetVariables "a" "b" "c"
How would I ex开发者_JAVA百科tract information between the first set of quotations? Then the second? Then the third?
>>> import re
>>> re.findall('"([^"]*)"', 'SetVariables "a" "b" "c" ')
['a', 'b', 'c']
You could do a string.split() on it. If the string is formatted properly with the quotation marks (i.e. even number of quotation marks), every odd value in the list will contain an element that is between quotation marks.
>>> s = 'SetVariables "a" "b" "c"';
>>> l = s.split('"')[1::2]; # the [1::2] is a slicing which extracts odd values
>>> print l;
['a', 'b', 'c']
>>> print l[2]; # to show you how to extract individual items from output
c
This is also a faster approach than regular expressions. With the timeit module, the speed of this code is around 4 times faster:
% python timeit.py -s 'import re' 're.findall("\"([^\"]*)\"", "SetVariables \"a\" \"b\" \"c\" ")'
1000000 loops, best of 3: 2.37 usec per loop
% python timeit.py '"SetVariables \"a\" \"b\" \"c\"".split("\"")[1::2];'
1000000 loops, best of 3: 0.569 usec per loop
Regular expressions are good at this:
import re
quoted = re.compile('"[^"]*"')
for value in quoted.findall(userInputtedText):
print value
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