I have an interesting little problem that I'm wondering if someone knows how to solve using regular expressions:
Given some larger text, where you have many subsections that are made up of a token A followed by an indeterminate amount of text NOT including token B and then token C, how can you find those chunks of text? I've been trying with Perl-compatible Regular Expressions through PHP, but can't come up with a way to do it.
For example,
I have an XML file, with a bunch of records. Some records are fine. Others are missing a chunk. I want to find the broken records and insert the missing tags.
Broken Record
</fh>
30101 Agoura Ct., #115<br /></location_addr1> <location_addr2></location_addr2>
Fixed Record </fh> <location id=""> <location_name>
</location_name> <location_addr1>30101 Agoura Ct., #115<br /></location_addr1> <location_addr2></location_addr2>
I thought I would be able to find </fh> followed by </locacation_addr1> and do a lookback negative assertion to say that <location_addr1> was not present. However, not knowing the length of text between </fh> and </location_addr1> seems to make this impossible.
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