Using regex in Swift to find a substring of a string

Question

I'm using the following code to find a substring using regex in Swift:

    let searchString = "Please contact us at <a href=\"tel:8882223434\" ><font color=\"#003871\"><b> 888.222.3434 </b></font></a> for assistance"
    let regexp = "^\\d+(\\.\\d+)*$"
    if let range = searchString.range(of:regexp, options: .regularExpression) {
        let result = searchString.substring(with:range)
        print(result) // <---- not printing the resulting string
    }

The desired output is 888.222.3434

Any help would be greatly appreciated. Thank you.

Wiktor Stribiżew · Accepted Answer · 2017-09-03 16:41:35Z

2

Remove the anchors and replace * with +.

let regexp = "\\d+(\\.\\d+)+"

Details

\d+ - 1 or more digits
(\\.\\d+)+ - one or more sequences of:
- \. - a dot
- \d+ - 1 or more digits.

answered Sep 3, 2017 at 16:41

Wiktor Stribiżew

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1 Comment

Wallace Over a year ago

Thank you, your answer worked out perfectly for my need!

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