javascript网址安全的文件名安全的字符串 [英] javascript url-safe filename-safe string

问题描述

正在寻找正则表达式/替换函数，以接受用户输入的字符串，例如"John Smith的Cool Page"，并返回文件名/URL安全字符串，例如"john_smith_s_cool_page.html"，或类似的内容.

Looking for a regex/replace function to take a user inputted string say, "John Smith's Cool Page" and return a filename/url safe string like "john_smith_s_cool_page.html", or something to that extent.

推荐答案

好吧，这是一个替换不是字母或数字的东西，并将其全部小写的东西，例如您的示例.

Well, here's one that replaces anything that's not a letter or a number, and makes it all lower case, like your example.

var s = "John Smith's Cool Page";
var filename = s.replace(/[^a-z0-9]/gi, '_').toLowerCase();

说明:

正则表达式为/[^a-z0-9]/gi.好吧，实际上，gi只是在使用表达式时使用的一组选项.

The regular expression is /[^a-z0-9]/gi. Well, actually the gi at the end is just a set of options that are used when the expression is used.

• i的意思是忽略大小写差异"
• g的意思是全局"，这实际上意味着应该替换每个匹配，而不仅仅是第一个匹配.

• i means "ignore upper/lower case differences"
• g means "global", which really means that every match should be replaced, not just the first one.

所以我们正在寻找的实际上只是[^a-z0-9].让我们逐步阅读它:

So what we're looking as is really just [^a-z0-9]. Let's read it step-by-step:

• [和]定义一个字符类"，它是一个单字符列表.如果您要写[one]，那么它将与'o'或'n'或'e'相匹配.
• 但是，字符列表的开头有一个^.这意味着它应该只与列表中的不字符匹配.
• 最后，字符列表为a-z0-9.将此读为"a到z和0到9".这是写abcdefghijklmnopqrstuvwxyz0123456789的一种简短方法.

• The [ and ] define a "character class", which is a list of single-characters. If you'd write [one], then that would match either 'o' or 'n' or 'e'.
• However, there's a ^ at the start of the list of characters. That means it should match only characters not in the list.
• Finally, the list of characters is a-z0-9. Read this as "a through z and 0 through 9". It's is a short way of writing abcdefghijklmnopqrstuvwxyz0123456789.

所以基本上，正则表达式是:查找不在'a'和'z'之间或在'0'和'9'之间的每个字母".

So basically, what the regular expression says is: "Find every letter that is not between 'a' and 'z' or between '0' and '9'".

这篇关于javascript网址安全的文件名安全的字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！