PHP has some sets of functions, which are not known to the wide audience. One of those is mb_ereg_* family of functions.
There is a common misunderstanding, that mb_ereg_* functions are just unicode counterparts of ereg_* functions: slow and non-powerful.
That’s as far from truth as it can be.
mb_ereg_* functions are based on oniguruma regular expressions library.
And oniguruma is one of the fastest and most capable regular expression libraries out there. Couple of years ago...
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