js正则表达式replace

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"240000000000cc".replace(/(\d)(?=(\d{3})+(?!\d))/g,"$1,")

"240,000,000,000cc"

"240000000000cc".replace(/(\d)(?=(\d{3})+(?!\d))/g,"$`,")

"2424,0024000,0024000000,000cc"


"2424,0024000,0024000000,000cc"
                24000,00
                2400
                24

"2400000000000cc".replace(/(\d)(?=(\d{3})+(?!\d))/g,"$',")

"400000000000cc,40000000000cc,00000000cc,00000cc,000cc"





24000000000cc,00000000cc,00000cc,000cc
  ,00000000cc
     ,00000cc
       ,000cc

24000000000cc        
2000000000cc,00000000cc,00000cc,000cc
 ,00000000cc
    ,00000cc
      ,000cc
      
000000000cc,00000000cc,00000cc,000cc
,00000000cc
   ,00000cc
     ,000cc
    
400000000000cc,40000000000cc,00000000cc,00000cc,000cc
,40000000000cc

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