How to get "m" meters and "km" from string using regex?-CodePudding

I was trying to get integer from below string and convert it again replace it . Need regex pattern to get mtr, km array from string. Little help will be highly appreciated.

let stringText = "Please continue for 290 m. And then take left and continue for 1.2 km.";
console.log(stringText);
let mtr_pattern = "";
let kn_pattern = "";
let numArr = stringText.match(/\d \.\d |\d \b|\d (?=\w)/g) || []);
numArr = numArr.filter(n => n != '.');
console.log("numArry", numArr);

output should be : Please continue for 0.18 miles. And then take left and continue for 0.74 miles

CodePudding user response：

You could take the numerical value and the unit. Then convert the value to miles.

let
    km2miles = km => km * 0.621371,
    string = "Please continue for 290 m. And then take left and continue for 1.2 km.",
    result = string.replace(
        /(\d \.?\d*) (k?m)/g,
        (_, a, b) => km2miles(b === 'km' ? a : a / 1000).toFixed(2)   ' miles'
    );

console.log(string);
console.log(result);