11-24-2017
does not work. A character set
[ ] is a range for only one character!
As said in your other thread, you must have a character set for each relevant character position.
A
3 then a dot then a character set for the range
7-9. This does not match a 4.00 and is correct because it should be less than 4.0.
If there are always two decimal digits then you can add a further character set
[0-9] that means "any digit".
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LEARN ABOUT REDHAT
iswdigit
ISWDIGIT(3) Linux Programmer's Manual ISWDIGIT(3)
NAME
iswdigit - test for decimal digit wide character
SYNOPSIS
#include <wctype.h>
int iswdigit(wint_t wc);
DESCRIPTION
The iswdigit function is the wide-character equivalent of the isdigit function. It tests whether wc is a wide character belonging to the
wide character class "digit".
The wide character class "digit" is a subclass of the wide character class "xdigit", and therefore also a subclass of the wide character
class "alnum", 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 "digit" is disjoint from the wide character class "cntrl".
Being a subclass of the wide character class "graph", the wide character class "digit" 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 "digit" is disjoint from the wide character class "punct".
The wide character class "digit" is disjoint from the wide character class "alpha" and therefore also disjoint from its subclasses "lower",
"upper".
The wide character class "digit" always contains exactly the digits '0' to '9'.
RETURN VALUE
The iswdigit function returns non-zero if wc is a wide character belonging to the wide character class "digit". Otherwise it returns zero.
CONFORMING TO
ISO/ANSI C, UNIX98
SEE ALSO
isdigit(3), iswctype(3)
NOTES
The behaviour of iswdigit depends on the LC_CTYPE category of the current locale.
GNU
1999-07-25 ISWDIGIT(3)