{"id":9142,"date":"2022-09-17T10:02:06","date_gmt":"2022-09-17T04:32:06","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-regular-expression-generation-in-swift-duplicate\/"},"modified":"2022-09-17T10:02:06","modified_gmt":"2022-09-17T04:32:06","slug":"solved-regular-expression-generation-in-swift-duplicate","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-regular-expression-generation-in-swift-duplicate\/","title":{"rendered":"[Solved] Regular Expression generation in Swift [duplicate]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-54501471\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"54501471\" data-parentid=\"54501028\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>You could do something like this :<\/p>\n<pre><code>let str = \"_h Hello _h _h World _h\"\n\nlet range =  NSRange(str.startIndex..., in: str)\n\nlet regex = try! NSRegularExpression(pattern: \"(?&lt;=_h).+?(?=_h)\")\n\nlet matches = regex.matches(in: str, range: range)\n\nlet results: [String] = matches.compactMap { match in\n    let subStr = String(str[Range(match.range, in: str)!]).trimmingCharacters(in: .whitespacesAndNewlines)\n    return subStr.isEmpty ? nil : subStr\n}\n\nprint(results)  \/\/[\"Hello\", \"World\"]\n<\/code><\/pre>\n<p>Here is the regex explained : <\/p>\n<ul>\n<li><code>(?&lt;=_h)<\/code> : Positive lookbehind for <code>_h<\/code> literally (case sensitive);<\/li>\n<li><code>.+?<\/code> : Matches any character (except for line terminators), between 1 and unlimited times, as few times as possible, expanding as needed;<\/li>\n<li><code>(?=_h)<\/code> : Positive lookahead for <code>_h<\/code> literally (case sensitive).<\/li>\n<\/ul>\n<p><strong>N.B<\/strong> : Force-unwrapping when constructing <code>subStr<\/code> is safe.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Regular Expression generation in Swift [duplicate] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You could do something like this : let str = &#8220;_h Hello _h _h World _h&#8221; let range = NSRange(str.startIndex&#8230;, in: str) let regex = try! NSRegularExpression(pattern: &#8220;(?&lt;=_h).+?(?=_h)&#8221;) let matches = regex.matches(in: str, range: range) let results: [String] = matches.compactMap { match in let subStr = String(str[Range(match.range, in: str)!]).trimmingCharacters(in: .whitespacesAndNewlines) return subStr.isEmpty ? nil &#8230; <a title=\"[Solved] Regular Expression generation in Swift [duplicate]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-regular-expression-generation-in-swift-duplicate\/\" aria-label=\"More on [Solved] Regular Expression generation in Swift [duplicate]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[347,522],"class_list":["post-9142","post","type-post","status-publish","format-standard","hentry","category-solved","tag-regex","tag-swift"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Regular Expression generation in Swift [duplicate] - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-regular-expression-generation-in-swift-duplicate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Regular Expression generation in Swift [duplicate] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You could do something like this : let str = &quot;_h Hello _h _h World _h&quot; let range = NSRange(str.startIndex..., in: str) let regex = try! NSRegularExpression(pattern: &quot;(?&lt;=_h).+?(?=_h)&quot;) let matches = regex.matches(in: str, range: range) let results: [String] = matches.compactMap { match in let subStr = String(str[Range(match.range, in: str)!]).trimmingCharacters(in: .whitespacesAndNewlines) return subStr.isEmpty ? nil ... 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NSRegularExpression(pattern: \"(?&lt;=_h).+?(?=_h)\") let matches = regex.matches(in: str, range: range) let results: [String] = matches.compactMap { match in let subStr = String(str[Range(match.range, in: str)!]).trimmingCharacters(in: .whitespacesAndNewlines) return subStr.isEmpty ? nil ... 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