The first one is support for Perl-style matching regexp delimiters, i.e.
using <[{( and )}]> to delimit the regular expressions.
The second one is a new 'F' modifier that allows you to specify a function name
in the replacement argument to preg_replace(). This function will be called
when the replacement needs to be made. It is passed an array of full matched
pattern and captured subpatterns and it is expected to return a string that
will be used for replacement. 'e' and 'F' modifiers cannot be used together.
@- Implemented support for Perl-style matching regexp delimiters in PCRE.
@ You can use <{[( and )]}> to delimit your expressions now. (Andrei)
@- Introduced new 'F' modifier in PCRE that lets you specify a function
@ name in the replacement argument to preg_replace() that will be called
@ at run-time to provide the replacement string. It is passed an array of
@ matched pattern and subpatterns. (Andrei)
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