[英]Replacing filename with a Regex in JavaScript
I need to replace a button using a Regex in JavaScript and was wondering how to do this. 我需要使用JavaScript中的Regex替换按钮,并且想知道如何执行此操作。 I know how to grab the src of the button, but I need to take the filename and either add some text "-next" or remove "-next", based on two options that can be toggled.
我知道如何获取按钮的src,但是我需要获取文件名并根据两个可以切换的选项添加一些文本“ -next”或删除“ -next”。 Here are the two different file names:
这是两个不同的文件名:
/images/button.png
/images/button-next.png
Any help would be greatly appreciated. 任何帮助将不胜感激。
To insert a -next
before the final dot, you could do 要在最后一个点之前插入
-next
,您可以执行
result = subject.replace(/(?=\.[^.]+$)/g, "-next");
To remove a -next
before the final dot: 要在最后一个点之前删除
-next
:
result = subject.replace(/-next(?=\.[^.]+$)/g, "");
That looks to me like what you need is pretty simple: 在我看来,您所需要的非常简单:
if (addingNext) {
return str.replace(/\.png$/i, '-next.png');
} else {
return str.replace(/-next\.png$/i, '.png');
}
if (url.match(/-next/))
newUrl = url.replace("-next.", ".");
else newUrl = url.replace(".", "-next.");
function toggle(img){
if(img.src.match(/-next\.[^\.]+$/)){
img.src=img.src.replace(/\.[^\.]+$/,'-next$&');
return true;
}
img.src=img.src.replace(/-next(\.[^\.]+)$/,'$1');
return true;
}
Works on any file extension. 适用于任何文件扩展名。
var src1 = "/images/button.png";
var src2 = "/images/button-next.png";
src1 = src1.replace(/\.(\w+)/, "-next.$1");
src2 = src2.replace("-next", "");
var str = "/images/button.png";
var idx = str.lastIndexOf('.');
var replValue = "-next";
var newStr = str.substring(0,idx) + replValue +
str.substring(idx);
There are probably more efficient ways, but that would work. 可能有更有效的方法,但这是可行的。 You'd also want to test for no .
您还想测试否。 found.
找到了。 You can also use a regex but that is more explicit.
您也可以使用正则表达式,但这更为明确。
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