JavaScript：如何使用 RegEx 获取字符串中的特定文本

Question

I tummbled into this RegEx and I googled it. A lot. But unfortunately didn't quite understand how RegEx works... So to make this quick since only a tiny winny part of my work requires it so I will be needing you guys. again :))

So here it goes...

All I want is to retrieve a specific string with a format of 0000x0000 . For example:

Input: NameName975x945NameName Output: 975x945

Must also consider string like this: NameNameName9751x9451NameNameName (the integer and string are longer...)

Answer 1

Use regex in String.prototype.match() to get specific part of string.

str.match(/\d+x\d+/)[0]

 var str = "NameName975x945NameName"; var match = str.match(/\\d+x\\d+/)[0]; console.log(match)

Answer 2

We need a bit more detail, but I'll go in order:

Assuming there can be any number of digits before and after the x, and these can be of different lengths:

[\\d]+x[\\d]+

Assuming the number of digits before the x needs to be equal to the number of digits after the x (as in your example) and this number is finite (and small enough so that your regex isn't obscenely long):

[\\d]{1}x[\\d]{1}|[\\d]{2}x[\\d]{2}|[\\d]{3}x[\\d]{3} (and so on)

Check out this related answer for more details on handling this as the length of the number gets longer.

Then you can use String.prototype.match() with your regex to grab the matches within your string.