Fix incorrect regular expression

Author: satoshi-takano

OpenGraph/OpenGraphParser.swift

@@ -24,7 +24,7 @@ extension OpenGraphParser {
             options: []
         )
         let contentRegexp = try! NSRegularExpression(
-            pattern: "\\scontent=(?:\"|\')(.*?)(?:\"|\')(?:\\s|>)",
+            pattern: "\\scontent=\"(.*?)\"",
             options: []
         )
 
@@ -40,7 +40,14 @@ extension OpenGraphParser {
                                                range: NSMakeRange(0, metaTag.count))
                 guard let propertyResult = propertyMatches.first else { return nil }
 
-                let contentMatches = contentRegexp.matches(in: metaTag, options: [], range: NSMakeRange(0, metaTag.count))
+                var contentMatches = contentRegexp.matches(in: metaTag, options: [], range: NSMakeRange(0, metaTag.count))
+                if contentMatches.first == nil {
+                    let contentRegexp = try! NSRegularExpression(
+                        pattern: "\\scontent='(.*?)'",
+                        options: []
+                    )
+                    contentMatches = contentRegexp.matches(in: metaTag, options: [], range: NSMakeRange(0, metaTag.count))
+                }
                 guard let contentResult = contentMatches.first else { return nil }
 
                 let nsMetaTag = metaTag as NSString

Tests/OpenGraphTests.swift

@@ -155,4 +155,16 @@ class OpenGraphTests: XCTestCase {
             XCTAssert(error! is OpenGraphParseError)
         }
     }
+
+    func testParsing() {
+        var html = "<meta content=\"It's a description\" property=\"og:description\" />"
+        XCTAssert(OpenGraph(htmlString: html)[.description] == "It's a description")
+        html = "<meta property=\"og:title\" content=\"It's a title contains single quote\"/>"
+        XCTAssert(OpenGraph(htmlString: html)[.title] == "It's a title contains single quote")
+
+        html = "<meta content='It&#39;s a description' property='og:description' />"
+        XCTAssert(OpenGraph(htmlString: html)[.description] == "It&#39;s a description")
+        html = "<meta content='It is a title contains double quote \"' property='og:title' />"
+        XCTAssert(OpenGraph(htmlString: html)[.title] == "It is a title contains double quote \"")
+    }
 }