在JavaScript中替换字符串/字符的所有实例的最快方法是什么?while, for循环,正则表达式?
当前回答
// Find, Replace, Case
// i.e "Test to see if this works? (Yes|No)".replaceAll('(Yes|No)', 'Yes!');
// i.e.2 "Test to see if this works? (Yes|No)".replaceAll('(yes|no)', 'Yes!', true);
String.prototype.replaceAll = function(_f, _r, _c){
var o = this.toString();
var r = '';
var s = o;
var b = 0;
var e = -1;
if(_c){ _f = _f.toLowerCase(); s = o.toLowerCase(); }
while((e=s.indexOf(_f)) > -1)
{
r += o.substring(b, b+e) + _r;
s = s.substring(e+_f.length, s.length);
b += e+_f.length;
}
// Add Leftover
if(s.length>0){ r+=o.substring(o.length-s.length, o.length); }
// Return New String
return r;
};
其他回答
@Gumbo添加额外的答案- user.email.replace(/foo/gi,"bar");
/foo/g - Refers to the all string to replace matching the case sensitive
/foo/gi - Refers to the without case sensitive and replace all For Eg: (Foo, foo, FoO, fOO)
DEMO
像这样使用正则表达式对象
var regex = new RegExp(' ' ', 'g'); STR = STR .replace(regex, '\ ");
它将取代所有出现的“into”。
var mystring = 'This is a string';
var newString = mystring.replace(/i/g, "a");
newString现在是'Thas as a strange '
我不知道最快的是什么,但我知道最易读的是什么——最短最简单的是什么。即使它比其他溶液慢一点,也值得使用。
所以使用:
"string".replace("a", "b");
"string".replace(/abc?/g, "def");
享受好的代码而不是更快的速度(嗯…1/100000秒不是差)和丑陋的差。;)
// Find, Replace, Case
// i.e "Test to see if this works? (Yes|No)".replaceAll('(Yes|No)', 'Yes!');
// i.e.2 "Test to see if this works? (Yes|No)".replaceAll('(yes|no)', 'Yes!', true);
String.prototype.replaceAll = function(_f, _r, _c){
var o = this.toString();
var r = '';
var s = o;
var b = 0;
var e = -1;
if(_c){ _f = _f.toLowerCase(); s = o.toLowerCase(); }
while((e=s.indexOf(_f)) > -1)
{
r += o.substring(b, b+e) + _r;
s = s.substring(e+_f.length, s.length);
b += e+_f.length;
}
// Add Leftover
if(s.length>0){ r+=o.substring(o.length-s.length, o.length); }
// Return New String
return r;
};