A bitmapped CInt containing options for execution of compiled regular expressions. Option values (and their man 3 regexec names) are
* execBlank which is a complete zero value for all the flags. This is the blankExecOpt value.
* execNotBOL (REG_NOTBOL) can be set to prevent ^ from matching at the start of the input.
* execNotEOL (REG_NOTEOL) can be set to prevent $ from matching at the end of the input (before the terminating NUL).