如何从（AB）点迅速获得价值

Question

I have this kind of string: " POINT(101.650577657408 3.1653186153213) ".

Anyone know how can I get the first and second value of POINT from this String?

Answer 1

You can easily spit the string using componentsSeparatedByString function.

let myStr = "POINT(101.650577657408 3.1653186153213)"
let characterSet = NSCharacterSet(charactersInString: "( )")
var splitString = myStr.componentsSeparatedByCharactersInSet(characterSet)
print(splitString[0])
print(splitString[1])
print(splitString[2])

The above only works if you have the complete one String.

Answer 2

Although the NSCharacterSet solution is correct but here is another solution using the most powerful regex .

var error: NSError?

// Initialise the regex for a float value
let regex: NSRegularExpression = NSRegularExpression(pattern: "(\\d*\\.\\d*)", options: NSRegularExpressionOptions.CaseInsensitive, error: &error)! 

// Matches array contains all the match found for float in given string
let matches: NSArray = regex.matchesInString(str as String, options: NSMatchingOptions.ReportProgress, range: NSMakeRange(0, str.length))

// You can easily get all values by enumeration
for match in matches {
    println(str.substringWithRange(match.range))
}

The benefit of this solution is it will scan all the float values and will also work in case of pattern got changed.

Answer 3

Try this, this will work for your string

    let myStr = "POINT(101.650577657408 3.1653186153213)"
    let strWithout_POINT_openingBrace = myStr.stringByReplacingOccurrencesOfString("POINT(", withString: "")//"101.650577657408 3.1653186153213)"
    let strWithout_closingBrace = strWithout_POINT_openingBrace.stringByReplacingOccurrencesOfString(")", withString: "")//"101.650577657408 3.1653186153213"
    //now you have only space between two values
    //so split string by space
    let arrStringValues = strWithout_closingBrace.componentsSeparatedByString(" ");//["101.650577657408","3.1653186153213"]

    print(arrStringValues[0]);//first value "101.650577657408"
    print(arrStringValues[1]);//second value "3.1653186153213"