做法使用 NSMutableString 的replaceOccurrencesOfString方法

下面例子，把字符串中的数字都替换做0

title=@"test123 test";

NSMutableString *mutableStr = [NSMutableString stringWithString:title];

[mutableStr replaceOccurrencesOfString:@"\\d+" withString:@"0" options:NSRegularExpressionSearch range:NSMakeRange(0,[mutableStr length])];

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