diff --git a/man3/regex.3 b/man3/regex.3 index 7c5132995..3144c2ceb 100644 --- a/man3/regex.3 +++ b/man3/regex.3 @@ -337,6 +337,48 @@ T} Thread safety MT-Safe .TE .SH CONFORMING TO POSIX.1-2001, POSIX.1-2008. +.SH EXAMPLES +.EX +#include +#include +#include +#include + +#define ARRAY_SIZE(arr) (sizeof((arr)) / sizeof((arr)[0])) + +static const char *const str = + "1) John Driverhacker;\en2) John Doe;\en3) John Foo;\en"; +static const char *const re = "John.*o"; + +int main(void) +{ + static const char *s = str; + regex_t regex; + regmatch_t pmatch[1]; + regoff_t off, len; + + if (regcomp(®ex, re, REG_NEWLINE)) + exit(EXIT_FAILURE); + + printf("String = \e"%s\e"\en", str); + printf("Matches:\en"); + + for (int i = 0; ; i++) { + if (regexec(®ex, s, ARRAY_SIZE(pmatch), pmatch, 0)) + break; + + off = pmatch[0].rm_so + (s \- str); + len = pmatch[0].rm_eo \- pmatch[0].rm_so; + printf("#%d:\en", i); + printf("offset = %jd; length = %jd\en", (intmax_t) off, (intmax_t) len); + printf("substring = \e"%.*s\e"\en", len, s + pmatch[0].rm_so); + + s += pmatch[0].rm_eo; + } + + exit(EXIT_SUCCESS); +} +.EE .SH SEE ALSO .BR grep (1), .BR regex (7)