{"id":11168,"date":"2024-03-14T13:32:50","date_gmt":"2024-03-14T13:32:50","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-extract-data-from-a-text-using-the-c-language\/"},"modified":"2025-08-04T08:25:31","modified_gmt":"2025-08-04T08:25:31","slug":"how-to-extract-data-from-a-text-using-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-extract-data-from-a-text-using-the-c-language\/","title":{"rendered":"C Data Extraction from Text Guide"},"content":{"rendered":"<p>To extract data from text, you can use string handling functions and a regular expression library in the C language. Below is an example code for extracting numbers.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;string.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;regex.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-type\">char<\/span> text[] = <span class=\"hljs-string\">\"The price of the product is $99.99\"<\/span>;\r\n    <span class=\"hljs-type\">char<\/span> pattern[] = <span class=\"hljs-string\">\"\\\\$([0-9]+\\\\.[0-9]+)\"<\/span>;\r\n    \r\n    <span class=\"hljs-type\">regex_t<\/span> regex;\r\n    <span class=\"hljs-type\">regmatch_t<\/span> matches[<span class=\"hljs-number\">2<\/span>];\r\n    \r\n    <span class=\"hljs-keyword\">if<\/span>(regcomp(&amp;regex, pattern, REG_EXTENDED) != <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Error compiling regex\\n\"<\/span>);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n    \r\n    <span class=\"hljs-keyword\">if<\/span>(regexec(&amp;regex, text, <span class=\"hljs-number\">2<\/span>, matches, <span class=\"hljs-number\">0<\/span>) == <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-type\">char<\/span> price[<span class=\"hljs-number\">20<\/span>];\r\n        <span class=\"hljs-built_in\">strncpy<\/span>(price, text + matches[<span class=\"hljs-number\">1<\/span>].rm_so, matches[<span class=\"hljs-number\">1<\/span>].rm_eo - matches[<span class=\"hljs-number\">1<\/span>].rm_so);\r\n        price[matches[<span class=\"hljs-number\">1<\/span>].rm_eo - matches[<span class=\"hljs-number\">1<\/span>].rm_so] = <span class=\"hljs-string\">'\\0'<\/span>;\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Price: %s\\n\"<\/span>, price);\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"No match found\\n\"<\/span>);\r\n    }\r\n    \r\n    regfree(&amp;regex);\r\n    \r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In this example, we use regular expressions to match prices ($99.99) in the text. We first compile the regular expression, then use the regexec function to search for matches in the text. If a match is found, we extract the price from the text and print it out. Finally, we release the regular expression object.<\/p>\n<p>Please note that this is just a simple example, actual text data extraction may require more complex regular expressions and processing logic.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To extract data from text, you can use string handling functions and a regular expression library in the C language. Below is an example code for extracting numbers. #include &lt;stdio.h&gt; #include &lt;string.h&gt; #include &lt;regex.h&gt; int main() { char text[] = &#8220;The price of the product is $99.99&#8221;; char pattern[] = &#8220;\\\\$([0-9]+\\\\.[0-9]+)&#8221;; regex_t regex; regmatch_t matches[2]; [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[381,560,14266,644,6175],"class_list":["post-11168","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-programming","tag-data-extraction","tag-regex-in-c","tag-string-handling","tag-text-parsing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C Data Extraction from Text Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Master text data extraction in C using regex &amp; string functions with practical examples. 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