Swift2.0で、文字列を正規表現で数字のみに置換するコード
RegExp.swift
var str:String = "1s2Hd34G"
str = str.stringByReplacingOccurrencesOfString("\\D", withString: "$1", options: NSStringCompareOptions.RegularExpressionSearch, range: nil)
// 1234
print(str)
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