* [PATCH] regex.3: Add example program
@ 2020-10-17 13:13 Alejandro Colomar
2020-10-17 13:17 ` Alejandro Colomar
0 siblings, 1 reply; 5+ messages in thread
From: Alejandro Colomar @ 2020-10-17 13:13 UTC (permalink / raw)
To: mtk.manpages; +Cc: Alejandro Colomar, linux-man, libc-alpha
$ 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
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] regex.3: Add example program
2020-10-17 13:13 [PATCH] regex.3: Add example program Alejandro Colomar
@ 2020-10-17 13:17 ` Alejandro Colomar
2020-10-17 13:27 ` [PATCH v2] " Alejandro Colomar
0 siblings, 1 reply; 5+ messages in thread
From: Alejandro Colomar @ 2020-10-17 13:17 UTC (permalink / raw)
To: mtk.manpages; +Cc: linux-man, libc-alpha
I realized now that the output is a bit weird:
I'm printing the offset incorrectly (except for the first match).
I'll fix it in a few minutes.
Thanks,
Alex
On 10/17/20 3:13 PM, Alejandro Colomar wrote:
> $ 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)
>
^ permalink raw reply [flat|nested] 5+ messages in thread* [PATCH v2] regex.3: Add example program
2020-10-17 13:17 ` Alejandro Colomar
@ 2020-10-17 13:27 ` Alejandro Colomar
2020-10-17 13:37 ` Alejandro Colomar
0 siblings, 1 reply; 5+ messages in thread
From: Alejandro Colomar @ 2020-10-17 13:27 UTC (permalink / raw)
To: mtk.manpages; +Cc: Alejandro Colomar, linux-man, libc-alpha
$ 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>
---
Hi Michael,
Now it's much better :)
Cheers,
Alex
man3/regex.3 | 42 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/man3/regex.3 b/man3/regex.3
index 7c5132995..72e576cc6 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 = \\"%s\\"\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 = \\"%.*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
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH v2] regex.3: Add example program
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)
0 siblings, 1 reply; 5+ messages in thread
From: Alejandro Colomar @ 2020-10-17 13:37 UTC (permalink / raw)
To: mtk.manpages; +Cc: linux-man, libc-alpha
Oops, I should've used \e instead of \\ (see below).
Please fix that :)
Thanks,
Alex
On 10/17/20 3:27 PM, Alejandro Colomar wrote:
> $ 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>
> ---
>
> Hi Michael,
>
> Now it's much better :)
>
> Cheers,
>
> Alex
>
> man3/regex.3 | 42 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
>
> diff --git a/man3/regex.3 b/man3/regex.3
> index 7c5132995..72e576cc6 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 = \\"%s\\"\en", str);
Here (twice)
> + 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 = \\"%.*s\\"\en", len, s + pmatch[0].rm_so);
And here (twice again)
> +
> + s += pmatch[0].rm_eo;
> + }
> +
> + exit(EXIT_SUCCESS);
> +}
> +.EE
> .SH SEE ALSO
> .BR grep (1),
> .BR regex (7)
>
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH v2] regex.3: Add example program
2020-10-17 13:37 ` Alejandro Colomar
@ 2020-10-17 14:35 ` Michael Kerrisk (man-pages)
0 siblings, 0 replies; 5+ messages in thread
From: Michael Kerrisk (man-pages) @ 2020-10-17 14:35 UTC (permalink / raw)
To: Alejandro Colomar; +Cc: mtk.manpages, linux-man, libc-alpha
On 10/17/20 3:37 PM, Alejandro Colomar wrote:
> Oops, I should've used \e instead of \\ (see below).
> Please fix that :)
Applied and fixed. Thanks Alex!
Cheers,
Michael
> Alex
>
> On 10/17/20 3:27 PM, Alejandro Colomar wrote:
>> $ 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>
>> ---
>>
>> Hi Michael,
>>
>> Now it's much better :)
>>
>> Cheers,
>>
>> Alex
>>
>> man3/regex.3 | 42 +++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 42 insertions(+)
>>
>> diff --git a/man3/regex.3 b/man3/regex.3
>> index 7c5132995..72e576cc6 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 = \\"%s\\"\en", str);
>
>
> Here (twice)
>
>> + 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 = \\"%.*s\\"\en", len, s + pmatch[0].rm_so);
>
>
> And here (twice again)
>
>> +
>> + s += pmatch[0].rm_eo;
>> + }
>> +
>> + exit(EXIT_SUCCESS);
>> +}
>> +.EE
>> .SH SEE ALSO
>> .BR grep (1),
>> .BR regex (7)
>>
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
^ permalink raw reply [flat|nested] 5+ messages in thread
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2020-10-17 13:13 [PATCH] regex.3: Add example program Alejandro Colomar
2020-10-17 13:17 ` 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)
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