pcre_utf16_to_host_byte_order (3) - Linux Manuals
pcre_utf16_to_host_byte_order: Perl-compatible regular expressions
PCRE - Perl-compatible regular expressions
int pcre16_utf16_to_host_byte_order(PCRE_UCHAR16 *output, PCRE_SPTR16 input, int length, int *host_byte_order, int keep_boms);
This function, which exists only in the 16-bit library, converts a UTF-16 string to the correct order for the current host, taking account of any byte order marks (BOMs) within the string. Its arguments are:
The result of the function is the number of 16-bit units placed into the output buffer, including the zero terminator if the string was zero-terminated.
If host_byte_order is not NULL, it is set to indicate the byte order that is current at the end of the string.
There is a complete description of the PCRE native API in the pcreapi page and a description of the POSIX API in the pcreposix page.