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| author | Alejandro Colomar <colomar.6.4.3@gmail.com> | 2020-10-17 15:27:49 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2020-10-17 16:35:36 +0200 |
| commit | 7e35a028664bbdd9e2a9a781d46f29e47a3bef8f (patch) | |
| tree | 194e674df310cadc49a84c54adb8f3ddbf71d995 | |
| parent | 740656b8553408238269770629afd5504fdde17e (diff) | |
| download | man-pages-7e35a028664bbdd9e2a9a781d46f29e47a3bef8f.tar.gz | |
regex.3: Add example program
$ gcc -Wall -Wextra -Werror -pedantic regex.c -o regex
$ ./regex.3
String = "1) John Driverhacker;
2) John Doe;
3) John Foo;
"
Matches:
#0:
offset = 25; length = 7
substring = "John Do"
#1:
offset = 38; length = 8
substring = "John Foo"
Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man3/regex.3 | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/man3/regex.3 b/man3/regex.3 index 7c51329950..3144c2ceb1 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 <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <regex.h> + +#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) |