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This article mainly introduces "what the antecedent assertion refers to in javascript". In the daily operation, I believe that many people have doubts about what the antecedent assertion refers to in javascript. The editor consulted all kinds of materials and sorted out a simple and useful method of operation. I hope it will be helpful for everyone to answer the doubt of "what antecedent assertion refers to in javascript". Next, please follow the editor to study!

Description

1. The first assertion is the match pattern that tells JavaScript to search forward in the string. It may be useful if you want to search for multiple matching patterns on the same string.

2. there are two kinds of antecedent assertions: positive antecedent assertion and negative antecedent assertion.

Example

Let quit = "qu"; let noquit = "qt"; let quRegex= / Q (? = u) /; let qRegex = / Q (?! U) /; quit.match (quRegex); noquit.match (qRegex); at this point, the study of "what the antecedent assertion in javascript refers to" is over, hoping to solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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