>Having a regexp library is hardly "modeling a language on Perl".
I don't know about most, but both PHP and Ruby were heavily influenced by Perl. If you've used both, this should be apparent, if not, you can easily find references on record to the effect. The original statement may have been a bit hyperbolic, but in context and with constraints something similar isn't unwarranted. E.g. "Perl was very influential to many of the most popular scripting languages today."