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Regex

7.2.5 Using Byte Offsets

In POSIX, variables of type regmatch_t hold analogous information, but are not identical to, GNU's registers (see section 7.1.8 Using Registers). To get information about registers in POSIX, pass to regexec a nonzero pmatch of type regmatch_t, i.e., the address of a structure of this type, defined in `regex.h':

typedef struct { regoff_t rm_so; regoff_t rm_eo; } regmatch_t;

When reading in 7.1.8 Using Registers, about how the matching function stores the information into the registers, substitute pmatch for regs, pmatch[i]->rm_so for regs->start[i] and pmatch[i]->rm_eo for regs->end[i].