How to use Javascript metacharacters

This article mainly introduces the relevant knowledge of "how to use Javascript metacharacters". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "how to use Javascript metacharacters" can help you solve the problem.

Description

1. Metacharacters can be used to search for all letters in the alphabet. This metacharacter is relatively common, with an abbreviation and an acronym that also contains extra characters.

2. The closest metacharacter that matches the alphabet is\ w. This abbreviation is equivalent to [A-Za-z0-9]. This character class matches the above letters and lowercase letters as well as numbers.

Note that this character class also contains the underscore character (_).

Example

The metacharacter\ w is required to calculate the number of alphanumeric characters in all quotation marks. Let quoteSample = "The five boxing wizards jump quickly."; let alphabetRegexV2 = / change/; / / modify this line let result = quoteSample.match (alphabetRegexV2) .length; refer to let quoteSample = "The five boxing wizards jump quickly."; let alphabetRegexV2 = /\ wdebg; / / modify this line let result = quoteSample.match (alphabetRegexV2) .length; this is the end of the introduction on "how to use Javascript metacharacters". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.