JavaScript常用正则函数用法示例

function RegExpMatch() {
  var str = "https://.jb51./jiaoben";
  var reg = /[j][\s\S]{3}/gi; // 注意g将全文匹配，不加将永远只返回第一个匹配
  var result = str.match(reg);
  alert(result); //返回jb51,jiao
}

function RegExpExec() {
  var str = "1234-5678";
  var reg = /(\d{4})-(\d{4})/;
  var result = reg.exec(str);
  alert(result); //返回1234-5678,1234,5678
  alert(result[1] + ' ' + result[2]); //1234 5678
  alert(RegExp.$1 + ' ' + RegExp.$2); //1234 5678
}

function RegExpTest() {
  var str = "https://.jb51./jiaoben";
  var reg = /^http:\/\/([\w-]+\.)+[\w-]+(\/[\w-])?$|^([\w-]+\.)+[\w-]+(\/[\w-])?$/;  //验证URL格式
  var result = false;
  if (reg.test(str)) {
    result = true;
  }
  alert(result);  //true
}

function RegExpSearch() {
  var str = "https://.jb51./jiaoben";
  var reg = /(jiaoben)/;
  var result = str.search(reg);
  alert(result);  //20
}

function RegExpReplace() {
  var str = "https://.jb51./jiaoben";
  var reg = /^(http:\/\/.jb51.)\/([\w])$/;
  var result = str.replace(reg, "$1?userId=$2");
  alert(result);  //https://.jb51.?userId=jiaoben
}

function RegExpSplit() {
  var str = "17@9";
  var reg = /@/;
  var result = str.split(reg); ;
  alert(result);  //[1,4,7,9]
}