通過在 swift 中修改匹配的字符串來使用正則表達式替換匹配項

Question

我試圖在 swift 中使用正則表達式替換匹配的字符串，我的要求如下

originalString = "It is live now at Germany(DE)"

我希望(" ")的字符串即DE用空格分隔，即“DE”

所以被替換的字符串應該是"It is live now at Germany(DE)"

我試過下面的代碼

var value: NSMutableString = "It is live now at Germany(DE)"
let pattern = "(\\([A-Za-z ]+\\))"
let regex = try? NSRegularExpression(pattern: pattern)
regex?.replaceMatches(in: value, options: .reportProgress, range: 
NSRange(location: 0,length: value.length), withTemplate: " $1 ")
print(value)

輸出是It is live now at Germany (DE) ，我知道這不是必需的。 這里它基於模板，我們不能根據匹配的字符串值進行修改。 有沒有辦法實現這一目標？

提前致謝

Answer 1

您可以使用

var value: NSMutableString = "It is live now at Germany(DE) or (SOFE)"
let pattern = "(?<=\\G(?<!\\A)|\\()[A-Za-z](?=[A-Za-z]+\\))"
let regex = try? NSRegularExpression(pattern: pattern)
regex?.replaceMatches(in: value, options: .reportProgress, range: NSRange(location: 0,length: value.length), withTemplate: "$0 ")
print(value)

要不就

let val =  "It is live now at Germany(DE) or (SOFE)"
let pattern = "(?<=\\G(?<!\\A)|\\()[A-Za-z](?=[A-Za-z]+\\))"
print( val.replacingOccurrences(of: pattern, with: "$0 ", options: .regularExpression, range: nil) )

輸出： It is live now at Germany(DE) or (SOFE)

圖案詳情

• (?<=\\\\G(?<!\\\\A)|\\\\() - 一個積極的后視，匹配一個位置緊跟在(或在前面的成功匹配的末尾
• [A-Za-z] - 匹配並使用任何 ASCII 字母
• (?=[A-Za-z]+\\\\)) - 一個正向前瞻，匹配緊跟其后是 1+ ASCII 字母和)字符的位置。

替換中的$0將整個匹配值插入到結果字符串中。