From: Alejandro Colomar <colomar.6.4.3@gmail.com>
To: mtk.manpages@gmail.com
Cc: Alejandro Colomar <colomar.6.4.3@gmail.com>,
linux-man@vger.kernel.org, libc-alpha@sourceware.org
Subject: [PATCH] regex.3: Add example program
Date: Sat, 17 Oct 2020 15:13:25 +0200 [thread overview]
Message-ID: <20201017131324.123039-1-colomar.6.4.3@gmail.com> (raw)
$ gcc -Wall -Wextra -Werror -pedantic regex.c -o regex
$ ./regex
String = "1) John Driverhacker;
2) John Doe;
3) John Foo;
"
#0 match:
rm_so = 25; rm_eo = 32; len = 7
substring = "John Do"
#1 match:
rm_so = 6; rm_eo = 14; len = 8
substring = "John Foo"
Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
---
Hello Michael,
Here's the example for regex.3 :-}
Best regards,
Alex
man3/regex.3 | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/man3/regex.3 b/man3/regex.3
index 7c5132995..94da88b7e 100644
--- a/man3/regex.3
+++ b/man3/regex.3
@@ -337,6 +337,50 @@ T} Thread safety MT-Safe
.TE
.SH CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
+.SH EXAMPLES
+.EX
+#include <stddef.h>
+#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 len;
+
+ if (regcomp(®ex, re, REG_NEWLINE))
+ exit(EXIT_FAILURE);
+
+ printf("String = \\"%s\\"\en", str);
+
+ for (ptrdiff_t i = 0; ; i++) {
+ if (regexec(®ex, s, ARRAY_SIZE(pmatch), pmatch, 0))
+ break;
+
+ len = pmatch[0].rm_eo \- pmatch[0].rm_so;
+ printf("#%td match:\en", i);
+ printf("rm_so = %jd; rm_eo = %jd; len = %jd\en",
+ (intmax_t) pmatch[0].rm_so,
+ (intmax_t) pmatch[0].rm_eo,
+ (intmax_t) len);
+ printf("substring = \\"%.*s\\"\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)
--
2.28.0
next reply other threads:[~2020-10-17 13:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-17 13:13 Alejandro Colomar [this message]
2020-10-17 13:17 ` [PATCH] regex.3: Add example program Alejandro Colomar
2020-10-17 13:27 ` [PATCH v2] " Alejandro Colomar
2020-10-17 13:37 ` Alejandro Colomar
2020-10-17 14:35 ` Michael Kerrisk (man-pages)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201017131324.123039-1-colomar.6.4.3@gmail.com \
--to=colomar.6.4.3@gmail.com \
--cc=libc-alpha@sourceware.org \
--cc=linux-man@vger.kernel.org \
--cc=mtk.manpages@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).