{"id":21790,"date":"2024-03-15T22:36:09","date_gmt":"2024-03-15T22:36:09","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-can-i-extract-numerical-values-from-a-string-in-qt\/"},"modified":"2024-03-21T21:19:38","modified_gmt":"2024-03-21T21:19:38","slug":"how-can-i-extract-numerical-values-from-a-string-in-qt","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-i-extract-numerical-values-from-a-string-in-qt\/","title":{"rendered":"How can I extract numerical values from a string in Qt?"},"content":{"rendered":"<p>In Qt, you can use some built-in methods of QRegExp, QStringList, or QString to extract numbers from a string.<\/p>\n<ol>\n<li>Use QRegExp:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>QString text = <span class=\"hljs-string\">\"Hello123World456\"<\/span>;\r\n<span class=\"hljs-function\">QRegExp <span class=\"hljs-title\">regex<\/span><span class=\"hljs-params\">(<span class=\"hljs-string\">\"\\\\d+\"<\/span>)<\/span><\/span>;  <span class=\"hljs-comment\">\/\/ \u5339\u914d\u4e00\u4e2a\u6216\u591a\u4e2a\u6570\u5b57<\/span>\r\n<span class=\"hljs-type\">int<\/span> pos = <span class=\"hljs-number\">0<\/span>;\r\n<span class=\"hljs-keyword\">while<\/span> ((pos = regex.<span class=\"hljs-built_in\">indexIn<\/span>(text, pos)) != <span class=\"hljs-number\">-1<\/span>) {\r\n    QString number = regex.<span class=\"hljs-built_in\">cap<\/span>(<span class=\"hljs-number\">0<\/span>);  <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u5339\u914d\u5230\u7684\u6570\u5b57<\/span>\r\n    <span class=\"hljs-comment\">\/\/ \u5904\u7406\u6570\u5b57<\/span>\r\n    <span class=\"hljs-built_in\">qDebug<\/span>() &lt;&lt; number;\r\n    pos += regex.<span class=\"hljs-built_in\">matchedLength<\/span>();\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Utilize QStringList:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>QString text = <span class=\"hljs-string\">\"Hello 123 World 456\"<\/span>;\r\nQStringList list = text.<span class=\"hljs-built_in\">split<\/span>(<span class=\"hljs-built_in\">QRegExp<\/span>(<span class=\"hljs-string\">\"\\\\D+\"<\/span>));  <span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u975e\u6570\u5b57\u5b57\u7b26\u5206\u5272\u5b57\u7b26\u4e32<\/span>\r\nforeach (<span class=\"hljs-type\">const<\/span> QString &amp;number, list) {\r\n    <span class=\"hljs-keyword\">if<\/span> (!number.<span class=\"hljs-built_in\">isEmpty<\/span>()) {\r\n        <span class=\"hljs-comment\">\/\/ \u5904\u7406\u6570\u5b57<\/span>\r\n        <span class=\"hljs-built_in\">qDebug<\/span>() &lt;&lt; number;\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Utilizing the toInt() or toDouble() method in QString:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>QString text = <span class=\"hljs-string\">\"Hello 123 World 456\"<\/span>;\r\nQString number;\r\n<span class=\"hljs-type\">int<\/span> pos = <span class=\"hljs-number\">0<\/span>;\r\n<span class=\"hljs-keyword\">while<\/span> (pos &lt; text.<span class=\"hljs-built_in\">length<\/span>()) {\r\n    <span class=\"hljs-keyword\">if<\/span> (text[pos].<span class=\"hljs-built_in\">isDigit<\/span>()) {  <span class=\"hljs-comment\">\/\/ \u627e\u5230\u6570\u5b57\u7684\u8d77\u59cb\u4f4d\u7f6e<\/span>\r\n        <span class=\"hljs-type\">int<\/span> startPos = pos;\r\n        <span class=\"hljs-keyword\">while<\/span> (pos &lt; text.<span class=\"hljs-built_in\">length<\/span>() &amp;&amp; text[pos].<span class=\"hljs-built_in\">isDigit<\/span>()) {\r\n            pos++;\r\n        }\r\n        number = text.<span class=\"hljs-built_in\">mid<\/span>(startPos, pos - startPos);  <span class=\"hljs-comment\">\/\/ \u622a\u53d6\u6570\u5b57<\/span>\r\n        <span class=\"hljs-comment\">\/\/ \u5904\u7406\u6570\u5b57<\/span>\r\n        <span class=\"hljs-built_in\">qDebug<\/span>() &lt;&lt; number;\r\n    }\r\n    pos++;\r\n}\r\n<\/code><\/pre>\n<p>Please choose the method that best suits your actual needs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Qt, you can use some built-in methods of QRegExp, QStringList, or QString to extract numbers from a string. Use QRegExp: QString text = &#8220;Hello123World456&#8221;; QRegExp regex(&#8220;\\\\d+&#8221;); \/\/ \u5339\u914d\u4e00\u4e2a\u6216\u591a\u4e2a\u6570\u5b57 int pos = 0; while ((pos = regex.indexIn(text, pos)) != -1) { QString number = regex.cap(0); \/\/ \u83b7\u53d6\u5339\u914d\u5230\u7684\u6570\u5b57 \/\/ \u5904\u7406\u6570\u5b57 qDebug() &lt;&lt; number; pos += regex.matchedLength(); [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-21790","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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>How can I extract numerical values from a string in Qt? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-can-i-extract-numerical-values-from-a-string-in-qt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How can I extract numerical values from a string in Qt?\" \/>\n<meta property=\"og:description\" content=\"In Qt, you can use some built-in methods of QRegExp, QStringList, or QString to extract numbers from a string. Use QRegExp: QString text = &quot;Hello123World456&quot;; QRegExp regex(&quot;\\d+&quot;); \/\/ \u5339\u914d\u4e00\u4e2a\u6216\u591a\u4e2a\u6570\u5b57 int pos = 0; while ((pos = regex.indexIn(text, pos)) != -1) { QString number = regex.cap(0); \/\/ \u83b7\u53d6\u5339\u914d\u5230\u7684\u6570\u5b57 \/\/ \u5904\u7406\u6570\u5b57 qDebug() &lt;&lt; number; pos += regex.matchedLength(); [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-can-i-extract-numerical-values-from-a-string-in-qt\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-15T22:36:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T21:19:38+00:00\" \/>\n<meta name=\"author\" content=\"Noah Thompson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Noah Thompson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-i-extract-numerical-values-from-a-string-in-qt\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-i-extract-numerical-values-from-a-string-in-qt\/\"},\"author\":{\"name\":\"Noah Thompson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/2e83cc6ab9f60d36921c2d0f9f280f4a\"},\"headline\":\"How can I extract numerical values from a string in Qt?\",\"datePublished\":\"2024-03-15T22:36:09+00:00\",\"dateModified\":\"2024-03-21T21:19:38+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-i-extract-numerical-values-from-a-string-in-qt\/\"},\"wordCount\":52,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-i-extract-numerical-values-from-a-string-in-qt\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-can-i-extract-numerical-values-from-a-string-in-qt\/\",\"name\":\"How can I extract numerical values from a string in Qt? 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