swift String extension

extension String {
    func substr(pos: Int,len:Int = -1) -> String {
        if pos + len > count(self) {
            return ""
        }
        let start = advance(self.startIndex,pos)
        let end = (-1 == len ?self.endIndex :advance(self.startIndex,pos + len))
        return self.substringWithRange(Range(start:start,end:end))
    }
    
    func split(sep: String) -> [String] {
        returnself.componentsSeparatedByString(sep)
    }
    
    func find(substr: String) ->Int? {
        if let range = self.rangeOfString(substr) {
            return distance(self.startIndex,range.startIndex)
        } else {
            return nil
        }
    }
    
    func findLast(substr: String) -> Int? {
        if let range = self.rangeOfString(substr,options:NSStringCompareOptions.BackwardsSearch) {
            return distance(self.startIndex,range.startIndex)
        } else {
            return nil
        }
    }
    
    func trimmed() -> String {
        returnself.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
    }
    
    func replace(before: String,after:String) -> String {
        return self.stringByReplacingOccurrencesOfString(before,withString: after)
    }

    func date() -> String {
        var curDate = NSDate()
        var timeFormatter = NSDateFormatter()
        timeFormatter.dateFormat = self // "yyyyMMddHHmmss"
        return timeFormatter.stringFromDate(curDate)
    }
    
    func date(date: NSDate) -> String {
        var timeFormatter = NSDateFormatter()
        timeFormatter.dateFormat = self
        return timeFormatter.stringFromDate(date)
    }

}

（编辑：李大同）

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