...
For extracting out hidden form fields, I used a simpler regular expression than the one in the article: <br/>id="__PREVIOUSPAGE"\s*value="(.*?)"<br/>
(
Note the '?' used to specify non-greedy regular-expression matching. I'm reluctant to replace the one in the main article, unless I know the reason for it). Note the '?' used to specify non-greedy regular-expression matching.
For pages that had 'jammed-in' pipe-delimited data, I use this type of regular expression instead: <br/>|__PREVIOUSPAGE|(.*?)|<br/>