Python : find substring with regex in files

Question

Im trying to find some pattern in my source files with python. This is what i code :

import os
import re

data=[]
pattern = re.compile('LocalizedString(.*)')

for dirname, dirnames, filenames in os.walk('.'):
    for filename in filenames:
        if '.m' in filename:
            with open(os.path.join(dirname, filename),'r') as f:
                for line in f:
                    matchObj = pattern.findall(line)
                    if matchObj:
                        for match in matchObj:
                            print "match : ", match

    if '.git' in dirnames:
        dirnames.remove('.git')

    if '.svn' in dirnames:
        dirnames.remove('.svn')

I want to get all the parameter of LocalizedString() call within source code, for example :
in source code :

[_deleteButton setTitle:LocalizedString(@"Delete my Account") forState:UIControlStateNormal];

I want to get @"Delete my Account", but I got this :

match :  (@"Delete my Account") forState:UIControlStateNormal];

Are there going to be instances where ) might be in parameter ? — user2705585
– user2705585, Commented Apr 14, 2016 at 8:26
Well, iOS code parsing might not be a good fit for a regex. Only for some specific contents. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Apr 14, 2016 at 8:28

cansik · Accepted Answer · 2016-04-14 08:21:59Z

1

The problem is that you are using brackets to create a group in your pattern. But you need to specify the start and the end of the statement. Use escaped brackets for that:

LocalizedString\((.*)\)

Check it out on regex101.

answered Apr 14, 2016 at 8:21

cansik

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6 Comments

Wiktor Stribiżew Over a year ago

What if there is another pair of parentheses after the LocalizedString()?

cansik Over a year ago

@WiktorStribiżew It shouldn't matter, because the .* matches everything to the last occurrence of the next statement. Here is an example: regex101.com/r/bH4nL2/3

Adib Over a year ago

I think Wiktor's use case is something like this: [_deleteButton setTitle:LocalizedString(@"Delete my Account") forState:UIControlStateNormal] ();

cansik Over a year ago

Well regex is not suitable for this case because it can't "count" the parenthesis.

dann Over a year ago

@cansik @Adib @Wiktor, I think this is most suitable for me for now, i don't have any lines with () after LocalizedString(), thank you

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