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In front-end web development, before the data goes to the back-end, it is necessary to do data verification, and regular expressions are needed.

However, when using regular expressions in js, you need to pay attention to writing on a separate line of regular expressions. There can be no regular expressions before and after regular expressions.

Quotation marks, single quotation marks are not allowed, nor can there be semicolons, which is responsible for the failure of the entire regular expression.

For example, I want to use a regular expression to verify compliance with the IP address in the input tag:

/ ^ (\ d {1pr 2} | 1\ d\ d | 2 [0-4]\ d | 25 [0-5])\. (\ d {1 # 4] 2} | 1\ d\ d | 2 [0-4]\ d | 25 [0-5])\. (\ d {0-4]\ d | 2 [0-5])\. (\ d {1 # 2} | 1\ d\ d | 2 [0-4]\ d | 25 [0-5]) $

However, in the js function, we need to write this, as shown in the figure:

It is important to note that regular expressions cannot be preceded by quotes, double quotes, and ending semicolons, otherwise the js function AddHost has no effect.

If you write a regular expression in the book above, you can verify the IP address:

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