Difference between W? and b

Hi everybody.

I am using php's preg_match() function.

I would like to match a word containing accents.

I would like this to return true :
preg_match("/^[a-zA-Z]+$/","énorme")

Is there a way to use a simple regular expression or do I
have to
write something like :
preg_match("/^[a-zA-ZEÈÉÊËeèéêë]+$/","énorme&
quot;)

Unlike english, french words have accents, so putting all
the possible
accents would be very annoying :(
I hope there is a workaround 


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