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Top Forums Shell Programming and Scripting perl -write values in a file to @array in perl Post 302322067 by KevinADC on Tuesday 2nd of June 2009 05:28:35 PM
Old 06-02-2009
By running the code you can see there is a difference between the two.

\w is the same as [:word:] which is the same as: a-zA-Z0-9_
[:alpha:] matches only letters a-zA-Z for which perl has no equivalent shortcut character class.
 

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ISWALPHA(3)						     Linux Programmer's Manual						       ISWALPHA(3)

NAME
iswalpha - test for alphabetic wide character SYNOPSIS
#include <wctype.h> int iswalpha(wint_t wc); DESCRIPTION
The iswalpha function is the wide-character equivalent of the isalpha function. It tests whether wc is a wide character belonging to the wide character class "alpha". The wide character class "alpha" is a subclass of the wide character class "alnum", and therefore also a subclass of the wide character class "graph" and of the wide character class "print". Being a subclass of the wide character class "print", the wide character class "alpha" is disjoint from the wide character class "cntrl". Being a subclass of the wide character class "graph", the wide character class "alpha" is disjoint from the wide character class "space" and its subclass "blank". Being a subclass of the wide character class "alnum", the wide character class "alpha" is disjoint from the wide character class "punct". The wide character class "alpha" is disjoint from the wide character class "digit". The wide character class "alpha" contains the wide character classes "upper" and "lower". The wide character class "alpha" always contains at least the letters 'A' to 'Z' and 'a' to 'z'. RETURN VALUE
The iswalpha function returns non-zero if wc is a wide character belonging to the wide character class "alpha". Otherwise it returns zero. CONFORMING TO
ISO/ANSI C, UNIX98 SEE ALSO
isalpha(3), iswctype(3) NOTES
The behaviour of iswalpha depends on the LC_CTYPE category of the current locale. GNU
1999-07-25 ISWALPHA(3)
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