Detailed explanation of Regular Expression Form Verification examples, detailed explanation of Regular Expression Form

Detailed explanation of Regular Expression Form Verification examples, detailed explanation of Regular Expression Form

Let's take a look:

First, I want to explain some symbolic meanings to you.

* Matches the previous subexpression zero or multiple times;
^ Match the start position of the input string; $ match the end position of the input string
1./^ $/This is a common format.
2. Enter the functions to be implemented.
\ D matches a numeric character, which is equivalent to [0-9]
+ Match the previous subexpression once or multiple times;
? Match the previous subexpression zero or one time;
The following code analyzes the Regular Expression and verifies the regular expression. The specific code is as follows:

<! DOCTYPE html> 
The above content is the regular expression instance code for form verification, which is helpful to everyone.
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