[英]Regular Expressions javascript how to check aa_bb
I'm trying to look for 2 digit string in URL. 我正在尝试在URL中查找2位数字的字符串。 For example:
例如:
www.abc.com/ff_gg/abc
I can check it with: 我可以用以下方法检查它:
if (window.location.href.indexOf("ff_gg") > -1) {
//
} else ...
but ff _ gg can be a random string. 但是ff _ gg可以是随机字符串。 How to use regex to save
ff
and gg
from a url as a variable ? 如何使用正则表达式将
ff
gg
和gg
保存为变量? ff
and gg
will be separated by _
. ff
和gg
将以_
分隔。
You can use String#search
with a regex, instead of String#indexOf
. 您可以使用带有正则表达式的
String#search
,而不是String#indexOf
。 Or RegExp#test
或
RegExp#test
Also see RegExp
to understand the expression. 另请参阅
RegExp
了解表达式。
const text = 'www.abc.com/ff_gg/abc'; const rx = /\\/[az]{2}_[az]{2}\\//i; if (text.search(rx) > -1) { console.log('found'); } else { console.log('not found'); } if (rx.test(text)) { console.log('found'); } else { console.log('not found'); }
You could use a similar regex to String#match
and capture, or RegExp#exec
. 您可以使用类似于
String#match
和capture的regex或RegExp#exec
。
Alternatively use string manipulation with String#split
or String#slice
. 或者使用
String#split
或String#slice
字符串操作。
As you see, there are several options (and even more that I've not mentioned) but I don't have time just now to create an example for each. 如您所见,有多个选项(甚至还有更多我没有提到的选项),但是我现在没有时间为每个选项创建示例。
const text = 'www.abc.com/ff_gg/abc'; const match = text.match(/\\/([az]{2})_([az]{2})\\//i); if (match) { console.log(match); }
const text = 'www.abc.com/ff_gg/abc'; const rx = /\\/[az]{2}_[az]{2}\\//i; const index = text.search(rx); if (index > -1) { console.log(text.slice(index + 1, index + 1 + 5).split('_')); }
In javascript you can make a RegExp
object. 在javascript中,您可以创建
RegExp
对象。 For more information about the RegExp
object see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions 有关
RegExp
对象的更多信息,请参见https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
The following example should work: 下面的示例应该起作用:
var url = "www.abc.com/ff_gg/abc"; var reg = new RegExp("([a-zA-Z]{2})_([a-zA-Z]{2})"); if (reg.test(url)) { var matches = url.match(reg); var ff = matches[1]; var gg = matches[2]; console.log("group1: " + ff); console.log("group2: " + gg); console.log("do something"); }
Here is also a example of the regex: http://regexr.com/3e8a7 这也是正则表达式的示例: http : //regexr.com/3e8a7
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