check for regex disabled if PCRE found

[David Bateman]

Just to point out that at the moment the changeset

http://hg.savannah.gnu.org/hgweb/octave/rev/f1534e248260

is probably not a good idea.. The regex_match class only uses regex and 
not pcre as it didn't need any of the advanced features of pcre. 
Therefore the above changeset effective removes the -regexp option from 
Fclear, Fwho, Fwhos, etc if pcre is found.

D.

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