03-11-2013
You may want to consider character classes in regexes.
man regex:
Quote:
Within a bracket expression, the name of a character class enclosed in "[:" and ":]" stands for the list of all characters belonging
to that class. Standard character class names are:
alnum digit punct
alpha graph space
blank lower upper
cntrl print xdigit
These stand for the character classes defined in wctype(3). A locale may provide others. A character class may not be used as an endpoint of a range.
Your locale may influence which chars are treated as e.g. alpha etc.
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LEARN ABOUT DEBIAN
iswalpha
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(3) 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 nonzero if wc is a wide character belonging to the wide-character class "alpha". Otherwise it returns
zero.
CONFORMING TO
C99.
NOTES
The behavior of iswalpha() depends on the LC_CTYPE category of the current locale.
SEE ALSO
isalpha(3), iswctype(3)
COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
1999-07-25 ISWALPHA(3)