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This article mainly introduces how to realize positive and negative pre-check in regular expression, which is very detailed and has certain reference value. Friends who are interested must finish reading it!

Let's first look at an example, and then explain what forward pre-checking is.

Example: there is a paragraph that reads "coming soon,going gogogo" and requires that com and go be found. The code is as follows:

/ / forward precheck function T1 () {var con = document.getElementsByName ('content') [0] .value; var reg = /\ b [\ w] + (? = ing\ b) / ing / match words with ing, but do not ing. Note: if you do not add\ b after ing, similar to goingabc will also match. Alert (con.match (reg));} regular preview above is all the content of the article "how to achieve positive and negative pre-checking in regular expressions". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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