Question

＆＃34; myDRange＆＃34;如果值中没有小数，则语句将返回一个范围。如果有小数，则返回nil。其他语句按预期返回范围。我做错了什么？

Swift3 - myDRange返回nil

var pseudoXML = "<d>4.0</d><rs>Test</rs><o>0</o>"
let myDRange = pseudoXML.range(of: "(?<=<d>)[^.]+(?=</d>)", options: .regularExpression)
let myRSRange = pseudoXML.range(of: "(?<=<rs>)[^.]+(?=</rs>)", options: .regularExpression)
let myORange = pseudoXML.range(of: "(?<=<o>)[^.]+(?=</o>)", options: .regularExpression)

Swift3 - myDRange返回范围

var pseudoXML = "<d>40</d><rs>Test</rs><o>0</o>"
let myDRange = pseudoXML.range(of: "(?<=<d>)[^.]+(?=</d>)", options: .regularExpression)
let myRSRange = pseudoXML.range(of: "(?<=<rs>)[^.]+(?=</rs>)", options: .regularExpression)
let myORange = pseudoXML.range(of: "(?<=<o>)[^.]+(?=</o>)", options: .regularExpression)

TIA

Answer 1

@CMan，

要使myDRange需要工作，请使用以下正则表达式＆＃34; (?<=<d>)([0-9](\\.[0-9]))+(?=</d>)＆＃34;

这将解决myDRange

的零问题

您的工作代码示例：

var pseudoXML = "<d>4.0</d><rs>Test</rs><o>0</o>"
let myDRange = pseudoXML.range(of: "(?<=<d>)([0-9](\\.[0-9]))+(?=</d>)", options: .regularExpression)
let myRSRange = pseudoXML.range(of: "(?<=<rs>)[^.]+(?=</rs>)", options: .regularExpression)
let myORange = pseudoXML.range(of: "(?<=<o>)[^.]+(?=</o>)", options: .regularExpression)

swift3 String.range（of：返回nil

1 个答案: