String number with special style

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        let str = 'haj123sdk54hask33dkhalsd879';
        
    let str1 = 'haj123sdk54hask33dkhalsd879';
        
    function findNum (str) {
        
      return str.match(/\d+/g);
        
    }
        

        
    let arr2 =  findNum(str).map(item => {
        
      let st= "<span class='colorBlue'>" + item + "</span>"
        
        str1 = str1.replace(item,st )
        
     return str1
        
    })
        
  console.log(arr2[arr2.length-1])
        
// haj<span class='colorBlue'>123</span>sdk<span class='colorBlue'>54</span>hask<span class='colorBlue'>33</span>dkhalsd<span class='colorBlue'>879</span>
       
       

        
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        'haj123sdk54hask33dkhalsd879'.replace(/\d+/g,s => `<span class='highlight'>${s}</span>`)
       
       

        
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The whole match

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        // The following example is to replace consecutive numbers with strings num
        
// RegExp(/\d+/g,'num')
        
let str =“12333”
        
// Replace all matches ：
        
let str2 =str.replace(/3/g,"2")
       
       

        
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