Javascript Javascript正则表达式：删除第一个和最后一个斜杠
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Javascript regular expression: remove first and last slash
提问by CorPao
I have these strings in javascript:
我在javascript中有这些字符串：
/banking/bonifici/italia
/banking/bonifici/italia/
and I would like to remove the first and last slash if it's exists.
如果存在，我想删除第一个和最后一个斜杠。
I tried ^\/(.+)\/?$but it doesn't work.
我试过了，^\/(.+)\/?$但没有用。
Reading some post in stackoverflow I found that php has trim function and I could use his javascript translation (http://phpjs.org/functions/trim:566) but I would prefer a "simple" regular expression.
阅读 stackoverflow 中的一些帖子，我发现 php 具有修剪功能，我可以使用他的 javascript 翻译（http://phpjs.org/functions/trim:566），但我更喜欢“简单”的正则表达式。
回答by kennytm
return theString.replace(/^\/|\/$/g, '');
"Replace all (/.../g) leading slash (^\/) or (|) trailing slash (\/$) with an empty string."
“用空字符串替换所有 ( /.../g) 前导斜杠 ( ^\/) 或 ( |) 尾随斜杠 ( \/$)。”
回答by Daniel Vandersluis
There's no real reason to use a regex here, string functions will work fine:
没有真正的理由在这里使用正则表达式，字符串函数可以正常工作：
var string = "/banking/bonifici/italia/";
if (string.charAt(0) == "/") string = string.substr(1);
if (string.charAt(string.length - 1) == "/") string = string.substr(0, string.length - 1);
// string => "banking/bonifici/italia"
See this in action on jsFiddle.
在jsFiddle上查看此操作。
References:
参考：
回答by Damaged Organic
In case if using RegExp is not an option, or you have to handle corner cases while working with URLs (such as double/triple slashes or empty lines without complex replacements), or utilizing additional processing, here's a less obvious, but more functional-style solution:
如果使用 RegExp不是一个选项，或者您必须在处理 URL 时处理极端情况（例如双/三斜杠或没有复杂替换的空行），或者使用额外的处理，这里有一个不太明显但功能更多的 -样式解决方案：
const urls = [
'//some/link///to/the/resource/',
'/root',
'/something/else',
];
const trimmedUrls = urls.map(url => url.split('/').filter(x => x).join('/'));
console.log(trimmedUrls);In this snippet filter()function can implement more complex logic than just filtering empty strings (which is default behavior).
在这个代码片段中，filter()函数可以实现更复杂的逻辑，而不仅仅是过滤空字符串（这是默认行为）。
Word of warning - this is not as fast as other snippets here.
警告 - 这不像这里的其他片段那么快。
回答by yckart
Just in case that someone needs a premature optimizationhere...
以防万一有人需要在这里过早优化......
http://jsperf.com/remove-leading-and-trailing-slashes/5
http://jsperf.com/remove-leading-and-trailing-slashes/5
var path = '///foo/is/not/equal/to/bar///'
var count = path.length - 1
var index = 0
while (path.charCodeAt(index) === 47 && ++index);
while (path.charCodeAt(count) === 47 && --count);
path = path.slice(index, count + 1)
