did not qualified! ! Regular expressions have a very powerful and complex object RegExp. In JavaScript version 1.2, it starts with
provided on.
Let’s take a look at the introduction to regular expressions:
Regular expression objects are used to standardize a standardized expression (that is, the expression does not meet specific requirements, such as whether it is Email
address format, etc.), which has properties and methods for checking whether the given string conforms to the rules.
In addition, the properties of individual regular expression objects you create using the RegExp constructor have already predefined regular expressions
Static properties of objects, you can use them at any time.
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