From patchwork Sat Oct 17 13:27:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alejandro Colomar X-Patchwork-Id: 40747 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id EE534385783D; Sat, 17 Oct 2020 13:30:27 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org EE534385783D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1602941428; bh=wEUoTYDCivi1nJNA5EPs1uUTPf5tj0A1VuN3l4I+7NI=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=RWZoPb4U1EtnD6XnhkcgMca0mRmrxf1QClWROHlkYPE8cLSho8ZBN3Fji+pP2YzB6 BJSuvgm0QTQVaDc60z+Eu+v/PMDWsBTxZmu2UieBPljjGzk2dxa3d9cBjpqMFhopYk F/JeOHoY4I1CNFJVIMmjcdBDnEaGyaPlGj9qP7i0= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-wr1-x429.google.com (mail-wr1-x429.google.com [IPv6:2a00:1450:4864:20::429]) by sourceware.org (Postfix) with ESMTPS id 356463857C4D for ; Sat, 17 Oct 2020 13:30:25 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 356463857C4D Received: by mail-wr1-x429.google.com with SMTP id y12so6526340wrp.6 for ; Sat, 17 Oct 2020 06:30:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=wEUoTYDCivi1nJNA5EPs1uUTPf5tj0A1VuN3l4I+7NI=; b=dwZqUSCI8wCkbELTWaIiUdk2eMU9uUwboCDBnxuD62Hwl70Micy3GphEimyjuEpLpD t6eJUOGKQ9ZsdJv8NCabldEvMFxHPWFmuQmWmPGgOzKvHLVoJaW1F2vdHT9Y7nyR4Ybf qai2eCSfGIlemB/YJkog/WGc/lwuCM9LfaP7rjMpmY3rZYH6IaOj7O230ZINWg9LWN5A gD21yfHGpXltCzLdAyKJfrK0nAFL3s4m3uN1T6c6NNRdhppnYRcLU8he1lfh5qTl0JjT gBDwJNQqhCnKGI+6vs7Kiuos9nOzO8HuYG1KwEuFvogRzpXyYt9lwcoqmxx9HC/zskyl T8hg== X-Gm-Message-State: AOAM531M5SJJBngA+6hzbRkLLctDVKVy6YyjYv7borTSChbJ4PXqDssS ayPgmzSVpmxH7T2uSGPrRdAcTqO+m28= X-Google-Smtp-Source: ABdhPJwwa64KCvA0fl6gpwRmwqVPPmikNki0LEwMU6HfJ3Atd0ZpfWAWNWdYO0DOckar7tAiQmAJmw== X-Received: by 2002:adf:b787:: with SMTP id s7mr10698458wre.390.1602941424370; Sat, 17 Oct 2020 06:30:24 -0700 (PDT) Received: from localhost.localdomain ([170.253.49.0]) by smtp.googlemail.com with ESMTPSA id s1sm7209347wmh.22.2020.10.17.06.30.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 17 Oct 2020 06:30:23 -0700 (PDT) To: mtk.manpages@gmail.com 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 X-Spam-Status: No, score=-10.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Alejandro Colomar via Libc-alpha From: Alejandro Colomar Reply-To: Alejandro Colomar Cc: Alejandro Colomar , linux-man@vger.kernel.org, libc-alpha@sourceware.org Errors-To: libc-alpha-bounces@sourceware.org Sender: "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 --- 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)