跳到主要内容

分组

2023年08月10日
柏拉文
越努力，越幸运

一、同类型后置​

正则表达式: /\w{1,2}(?=(\w{2})+$)/g

function groupValue(value, index, flag) {
  const reg = new RegExp(`\\w{1,${index}}(?=(\\w{${index}})+$)`, "g");
  return String(value).replace(reg, function (match, ...args) {
    return match + flag;
  });
}

const str = "aabbccddeeffgge";
console.log(groupValue(str,2,",")); // a,ab,bc,cd,de,ef,fg,ge

二、同类型后置​

方案二: /(\w{2}(?=\w))/g

function groupValue(value, index, flag) {
  const reg = new RegExp(`(\\w{${index}}(?=\\w))`, "g");
  return String(value).replace(reg, function (match, ...args) {
    return match + flag;
  });
}

const str = "aabbccddeeffgge";
console.log(groupValue(str,2,",")); // aa,bb,cc,dd,ee,ff,gg,e

三、数字运算符​

function groupValue(value, flag) {
  const reg =
    /(((\d+)(\.\d+)?)(?=[\+\-\*\/\(\)])|([\+\-\*\/\(\)]{1})(?=[\d\+\-\*\/\(\)]))/g;
  return String(value).replace(reg, function (match, ...args) {
    return match + flag;
  });
}

const str = "300.400*3.44-(3.44+4/2)";
console.log(groupValue(str,",").split(","));