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Sat, 17 Oct 2020 06:30:23 -0700 (PDT) From: Alejandro Colomar To: mtk.manpages@gmail.com Cc: Alejandro Colomar , linux-man@vger.kernel.org, libc-alpha@sourceware.org Subject: [PATCH v2] regex.3: Add example program Date: Sat, 17 Oct 2020 15:27:49 +0200 Message-Id: <20201017132748.150322-1-colomar.6.4.3@gmail.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org $ 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 --- 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 +#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 = \\"%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