I guess this it is a historically reason.
I remember a discussion to replace it but didn't remember the details
may you find something in the mail archive (developer list).
Am 22.02.2006 um 16:09 schrieb Elwin:
Why the url filter of nutch use Perl5 regular expressions? Any
benefits?
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《盖世豪侠》好评如潮，让无线收视居高不下，
无线高兴之余，仍未重用。周星驰岂是池中物，
喜剧天分既然崭露，当然不甘心受冷落，于是
转投电影界，在大银幕上一展风采。无线既得
千里马，又失千里马，当然后悔莫及。
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