ETA：

我只是想进一步澄清，我不想在正则表达式中使用硬编码值，我想在正则表达式中使用变量。
假设[This is my test]存储在一个变量中，即var defaultMsg = "[This is my test] ";

Answer 1

有人试过吗？

<script>
var defaultMsg ="[This is my test]"
var str         = "[This is my test] [This is my test] My name is xyz.";
str=str.replace(defaultMsg,"");
alert(str);
</script>

如果源字符串不是正则表达式对象而只是字符串，则不需要regexp和replace不关心特殊字符。测试了Mozilla 1.7，FF3.6.6，Safari 5，Opera 10和IE8 windows XP sp3。不确定我理解为什么如果它以最小的麻烦完成工作就会被拒绝。

要替换所有匹配项，请添加g（注意：这不是标准的）：

str=str.replace(defaultMsg,"","g"); // "gi" for case insensitivity

replace MDN

Answer 2

如果搜索模式位于字符串变量中并且可以包含特殊字符，则必须对其进行转义。像这样：

var defaultMsg  = "[This is my test] ";

//-- Must escape special characters to use in a RegEx.
defaultMsg      = defaultMsg.replace (/([\!\$\(\)\*\+\.\/\:\=\?\[\\\]\^\{\|\}])/g, "\\$1")

var zRegEx      = new RegExp (defaultMsg, '');

var Str         = '[This is my test] [This is my test] My name is xyz.';

Str             = Str.replace(zRegEx, "");

console.log (Str);  //-- Or use alert()

Answer 3

JavaScript replace函数默认为非全局，因此它只替换第一个匹配项：

var foo = '[This is my test] [This is my test] My name is xyz.';
var bar = foo.replace(/\[This is my test\]\s/, '');

如果您想要替换字符串的所有次出现，请通过附加g来使全局正则表达式全局：

var bar = foo.replace(/\[This is my test\]\s/g, '');

Answer 4

不确定。使用replace()：

var s = "[This is my test] [This is my test] My name is xyz.";
alert(s.replace(/\[This is my test\] /, ''));

如果您要替换所有次出现：

alert(s.replace(/\[This is my test\] /g, ''));

Answer 5

这将做你想要的：

str= '[This is my test] [This is my test] My name is xyz.';

str = str.replace(/\[This is my test\]/,"");

要替换所有出现的' [这是我的测试] ，您需要致电：

str = str.replace(/\[This is my test\]/g,"");

Answer 6

var str="[This is my test] [This is my test] My name is xyz.?";
var patt1=(/[[This is my test]].*My name is xyz/i);
document.write(str.match(patt1));

Answer 7

这样可以解决问题：

var foo = '[This is my test] ';// or whatever you want
foo = foo.replace(/([\[\]])/, '\\$1', 'g'); // add all special chars you want
var patern = new RegExp(foo);
var myString = '[This is my test] [This is my test] My name is xyz.';
var result = myString.replace(patern, '');

Answer 8

var originalText = '[This is my test] [This is my test] My name is xyz.';
var defaultMsg = "[This is my test] ";

alert( originalText.replace( defaultMsg , '' ) );

正则表达式替换javascript中第一次出现的匹配

ETA：

8 个答案: