| Message ID | 20201017131324.123039-1-colomar.6.4.3@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | regex.3: Add example program | expand |
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) >
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)
$ 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(+)