06-25-2014
That bracket expression is not, hm, invalid, but it might not match what you intend it to: it will match "a", "A", ALL chars from "0" to "z" (which includes a, A, Z, 9, but also e.g. "=" and "[", and, maybe some locale chars), then "Z" and "9". Make it [0-9A-Za-z] to include exactly those ranges.
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LEARN ABOUT MOJAVE
mbrlen_l
MBRLEN(3) BSD Library Functions Manual MBRLEN(3)
NAME
mbrlen, mbrlen_l -- get number of bytes in a character (restartable)
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <wchar.h>
size_t
mbrlen(const char *restrict s, size_t n, mbstate_t *restrict ps);
#include <wchar.h>
#include <xlocale.h>
size_t
mbrlen_l(const char *restrict s, size_t n, mbstate_t *restrict ps, locale_t loc);
DESCRIPTION
The mbrlen() function inspects at most n bytes, pointed to by s, to determine the number of bytes needed to complete the next multibyte char-
acter.
The mbstate_t argument, ps, is used to keep track of the shift state. If it is NULL, mbrlen() uses an internal, static mbstate_t object,
which is initialized to the initial conversion state at program startup.
It is equivalent to:
mbrtowc(NULL, s, n, ps);
Except that, when ps is a NULL pointer, mbrlen() uses its own static, internal mbstate_t object to keep track of the shift state.
Although the mbrlen() function uses the current locale, the mbrlen_l() function may be passed a locale directly. See xlocale(3) for more
information.
RETURN VALUES
The mbrlen() functions returns:
0 The next n or fewer bytes represent the null wide character (L'