Find number in string and return location and length

Question

let myStr = "I have 4.34 apples."

I need the location range and the length, because I'm using NSRange(location:, length:) to bold the number 4.34

extension String{
    func findNumbersAndBoldThem()->NSAttributedString{
         //the code
    }
}

vadian · Accepted Answer · 2019-01-07T14:42:31.290

1

My suggestion is also based on regular expression but there is a more convenient way to get NSRange from Range<String.Index>

let myStr = "I have 4.34 apples."
if let range = myStr.range(of: "\\d+\\.\\d+", options: .regularExpression) {
    let nsRange = NSRange(range, in: myStr)
    print(nsRange)
}

If you want to detect integer and floating point values use the pattern

"\\d+(\\.\\d+)?"

The parentheses and the trailing question mark indicate that the decimal point and the fractional digits are optional.

edited Jan 07 '19 at 14:42

answered Jan 05 '19 at 20:06

vadian

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if my apples are 4 the range is nil.. how to fix it ? – Bogdan Bogdanov Jan 07 '19 at 14:39
Thank you Sir! Can you please tell me where I can read about this ->. "\\d+(\\.\\d+)?" expressions to understand it ? Thanks! – Bogdan Bogdanov Jan 07 '19 at 14:50
A good tutorial is [Ray Wenderlich: NSRegularExpression Tutorial and Cheat Sheet](https://www.raywenderlich.com/2725-nsregularexpression-tutorial-and-cheat-sheet) – vadian Jan 07 '19 at 14:57

Find number in string and return location and length

1 Answers1