正则表达式头文件 regex.h 包括regcomp， regexec，regfree等主要函数-Regular expression header regex.h including regcomp, regexec, regfree other major functions

This only a wrapper around the <regex.h> file. XPG4.2 mentions this name. -This is only a wrapper around the <regex.h> file. XPG4.2 mentions this name.