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This article mainly introduces how to use js regular expression to match numbers related knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that everyone after reading this article on how to use js regular expression to match numbers will have something to gain, let's take a look.

1. Regular expressions use the

The most basic way to use regular expressions to match strings is the exec method of regular objects:

This method returns an array where the first element of the array is the text that matches the regular expression, followed by the text, if any, that matches several sub-expressions of the regular expression. If the match fails, null is returned.

The array returned by the exec method has two properties in addition to length:

Index: represents the position of the first character of the matching text

Input: stores the retrieved string

In addition to using the exec method, we can also use the match method of the String object, which is used similar to exec

Var str= "0hello1"; str.match (/\ dwatches /); / / ["0", index: 0, input: "0hello1", groups: undefined] str.match (/\ dhammer / g); / / ["0", "1"]

two。 Matching number

(1) user name regularization

/ / user name is regular, 4 to 16 digits (letters, numbers, underscores, minus signs) var uPattern = / ^ [a-zA-Z0-9 letters -] {4pm 16} $/; / output trueconsole.log (uPattern.test ("caibaojian"))

(2) password strength regularity

/ / password strength is regular, at least 6 characters, including at least 1 uppercase letter, 1 lowercase letter, 1 number, 1 special character var pPattern = / ^. * (? =. {6,}) (? =. *\ d) (? =. * [Amurz]) (? =. * [Amurz]) (?) (? =. * [! @ # $% ^ & *?]). / / output trueconsole.log ("=" + pPattern.test ("caibaojian#"))

(3) Integer regularity

/ / positive integer regular var posPattern = / ^\ dhammer / negative integer regular var negPattern = / ^ -\ dhammer / integer regular var intPattern = / ^ -?\ dhammer / output trueconsole.log (posPattern.test ("42")); / / output trueconsole.log (negPattern.test ("- 42")); / / output trueconsole.log ("- 42")) This is the end of the article on "how to match numbers with js regular expressions". Thank you for reading! I believe you all have some knowledge of "how to match numbers with js regular expressions". If you want to learn more, you are welcome to follow the industry information channel.

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