javascript/JavaScript-tutorial/String/replace.html at gh-pages · xgqfrms/javascript

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<!DOCTYPE html>

<head>

<title>.replace()</title>

</head>

<body>

<div>

<h1>正则表达式，过滤非数字（0-9）,字母（a-z, A-Z）以外的字符！</h1>

</div>

// reverse str function

function reverseString(str1) {

var a = [];//array

for (var i = 0; i < str1.length; i++) {

a[i] = str1[i];

// console.log("a[i]="+a[i]);

}

a.reverse();

// join()

str1 = a.join('');

return str1;

}

function palindrome(str) {

// Good luck!

var b;

//var reg = /\W/g;

//var reg = /([\[\]\{\}\^\$\＋\,\s\_\:\-\*\?\.\"\'\|\/\\])/g;

var reg = /([\[\]\{\}\^\$\+\s\_\:\-\*\?\.\"\'\|\/\\])/g;

var s = str.toLowerCase();

//var n = s.filter(reg);//TypeError: s.filter is not a function

var n = s.replace(reg,"");

//You'll need to remove all non-alphanumeric characters

if(n === reverseString(n)){

b = true;

}else{

b = false;

}

return b;

}

var xyz;

xyz = palindrome("_eye");

console.log(xyz);

xyz = palindrome("0_0 (: /-\ :) 0-0");

console.log(xyz);

//0000

xyz = palindrome("race car");

console.log(xyz);

xyz = palindrome("not a palindrome");

console.log(xyz);

xyz = palindrome("A man, a plan, a canal. Panama");

console.log(xyz);

xyz = palindrome("never odd or even");

console.log(xyz);

xyz = palindrome("My age is 0, 0 si ega ym.");

console.log(xyz);

xyz = palindrome("1 eye for of 1 eye.");

console.log(xyz);

xyz = palindrome("five|\_/|four");

console.log(xyz);

</script>

</body>

</html>

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