I'm looking around for a RegEx that can help me parse an nquad file. An nquad file is a straight text file where each line represents a quad (s, p, o, c):
<http://mysubject> <http://mypredicate> <http://myobject> <http://mycontext> .
<http://mysubject> <http://mypredicate2> <http://myobject2> <http://mycontext> .
<http://mysubject> <http://mypredicate2> <http://myobject2> <http://mycontext> .
The objects can also be literals (instead of uris), in which case they are enclosed with double quotes:
<http://mysubject> <http://mypredicate> "My object" <http://mycontext> .
I'm looking for a regex that given one line of this file, which will give me back a php array in the following format:
[0] => "http://mysubject"
[1] => "http://mypredicate"
[2] => "http://myobject"
[3] => "http://mycontext"
...or in the case where the double quotes are used for the object:
[0] => "http://mysubject"
[1] => "http://mypredicate"
[2] => "My Object"
[3] => "http://mycontext"
One final thing - in an ideal world, the regex will cater for the scenario there may be 1 or more spaces between the various components, e.g.
<http://mysubject> <http://mypredicate> "My object" <http://mycontext> .
I'm going to add another answer as an additional solution using only a regex and explode: