javascript 查找子字符串并插入另一个字符串
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Finding a substring and inserting another string
提问by Charles Yeung
Suppose I have string variable such as:
假设我有字符串变量，例如：
var a = "xxxxxxxxhelloxxxxxxxx";
or:
或者：
var a = "xxxxhelloxxxx";
I want to insert "world"after "hello".
我想在"world"之后插入"hello"。
I can't use substr()because the position is not known ahead of time. How can I do this in JavaScript or jQuery?
我无法使用，substr()因为位置不知道提前。我怎样才能在 JavaScript 或 jQuery 中做到这一点？
回答by gion_13
var a = "xxxxhelloxxxxhelloxxxx";
a = a.replace(/hello/g,"hello world"); // if you want all the "hello"'s in the string to be replaced
document.getElementById("regex").textContent = a;
a = "xxxxhelloxxxxhelloxxxx";
a = a.replace("hello","hello world"); // if you want only the first occurrence of "hello" to be replaced
document.getElementById("string").textContent = a;<p>With regex: <strong id="regex"></strong></p>
<p>With string: <strong id="string"></strong></p>回答by Dominic Barnes
This will replace the first occurrence
这将替换第一次出现
a = a.replace("hello", "helloworld");
If you need to replace all of the occurrences, you'll need a regular expression. (The gflag at the end means "global", so it will find all occurences.)
如果您需要替换所有出现的内容，则需要一个正则表达式。（g末尾的标志表示“全局”，因此它会找到所有出现的情况。）
a = a.replace(/hello/g, "helloworld");
回答by Guffa
This will replace the first occurance:
这将取代第一次出现：
a = a.replace("hello", "hello world");
If you need to replace all occurances, you use a regular expression for the match, and use the global (g) flag:
如果需要替换所有出现的情况，请使用正则表达式进行匹配，并使用全局 (g) 标志：
a = a.replace(/hello/g, "hello world");
回答by Bob Stein
Here's a way that avoids repeating the "hello" pattern:
这是一种避免重复“hello”模式的方法：
a_new = a.replace(/hello/, '$& world'); // "xxxxxxxxhello worldxxxxxxxx"
$&refers to the substring that matched the whole pattern. It is one of several special $ codesfor the replacement string.
$&指匹配整个模式的子串。它是替换字符串的几个特殊 $ 代码之一。
Here's another way to get the same result with a replacer function:
这是使用替换函数获得相同结果的另一种方法：
a_new = a.replace(/hello/, function (match) { return match + ' world'; });
回答by Marty
var find = "hello";
var a = "xxxxxxxxxxxxxhelloxxxxxxxxxxxxxxxx";
var i = a.indexOf(find);
var result = a.substr(0, i+find.length) + "world" + a.substr(i+find.length);
alert(result); //xxxxxxxxxxxxxhelloworldxxxxxxxxxxxxxxxx
Maybe.
或许。
回答by Jason Jong
You can use replace, would be much easier than indexOf
您可以使用替换，会比 indexOf 容易得多
var newstring = a.replace("hello", "hello world");
