How do I substract a substring from a JSON string using a regular expression?

Question

So I found these links which are related for the task. First using python, second using c#, third using Perl

Now I'm too new with Perl and what I want to do is work with some json streams from twitter. What I'm looking at is this:

..E","location":"Hollywood, Los Angeles, CA ","screen_name":"i..

How do I find "location": using regex and then assign a variable to contain Hollywood, Los Angeles, CA?

sub get_location {
# pseudo code:  
# look for "location":"xxxxxxxxxxxxxxxx" 
# assign $tmp_loc = Hollywood, Los Angeles, CA (in this case)
# return $tmp_loc; }

Dave Cross · Accepted Answer · 2010-11-08 08:35:46Z

8

Perl has libraries for dealing with JSON. Why not use one of those?

Alternatively, as you're dealing with Twitter, why not use Net::Twitter which makes Twitter API calls and returns the results to you as Perl data structures.

These days, a lot of Perl programming is a matter of knowing which CPAN modules to string together. If you're not using CPAN, then you're missing out on a lot of the power of Perl.

answered Nov 8, 2010 at 8:35

Dave Cross

69.5k3 gold badges55 silver badges101 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Halil Özgür · Accepted Answer · 2010-11-08 07:57:00Z

3

Perl JSON.

answered Nov 8, 2010 at 7:57

Halil Özgür

16k6 gold badges51 silver badges58 bronze badges

Comments

Alin P. · Accepted Answer · 2010-11-08 10:11:00Z

3

You really shouldn't use regular expressions anywhere you need to find something in a string... They have their purpose, but not here.

If you have a JSON encoded string just decode it. I have no experience with Perl but I see that others recommend using a module from CPAN.

edited Nov 8, 2010 at 10:11

answered Nov 8, 2010 at 7:57

Alin P.

44.5k13 gold badges79 silver badges93 bronze badges

Comments

krico · Accepted Answer · 2010-11-08 07:56:13Z

0

First you need a regex that matches the text you want to capture. Since you only put a snippet I will only put a snippet of it also.

$text = ' ..E","location":"Hollywood, Los Angeles, CA ","screen_name":"i..';
if( $text =~ /.*location":"(.[^"]+)",.*/ ) {
  $tmp_loc = $1;
}
return $tmp_loc;

answered Nov 8, 2010 at 7:56

krico

5,7282 gold badges27 silver badges28 bronze badges

2 Comments

zerolagtime Over a year ago

The recommendation by others to use the CPAN module is the right answer, at least to the question we all think should have been asked. That said, the text above is the precise answer to the question and is very handy to have. Both answers are valuable.

oalmgren Over a year ago

Yes I agree, thank you krico and the others who took their time answering.

Collectives™ on Stack Overflow

How do I substract a substring from a JSON string using a regular expression?

4 Answers 4

Comments

Comments

Comments

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

Comments

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related