import Foundation
let pattern = #"\<span\sclass\=\"js_value\stab-weather__value_l\"\>\s*+([+-]\d++)\s*+\<span\sclass\=\"tab-weather__value_m\"\>\s*+([.,]\d++)(?:\s*+\<\/span\>){2}"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
<span class="js_value tab-weather__value_l">
+6<span class="tab-weather__value_m">,2</span></span>
<span class="js_value tab-weather__value_l">
-12<span class="tab-weather__value_m">.45</span></span>
<span class="js_value tab-weather__value_l">
+0<span class="tab-weather__value_m">,1</span></span>
"""#
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let substitutionString = #"$1$2"#
let result = regex.stringByReplacingMatches(in: testString, range: stringRange, withTemplate: substitutionString)
print(result)
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression