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“This article will take you through how to use regular expressions in Go
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regexp.MustCompileuses this method and the returned value is the same.
Next we use regular expressions for matching, that is, regular expression matching in the method above.
The case is consistent with the one used in the figure above and is used to match email addresses.
Then write the first version first.
You can see that the returned result is what we want.
This part about how to write regular expressions is explained here. This article is mainly about how to use regular expressions in go.
The first problem will be reflected at this time, which is theFindStringmethod Only one value can be matched.
How to match multiple values! Please see the case below
You can see that the returned result is all that can be matched All the email addresses were matched.
To match multiple values, you need to use theFindAllStringmethod.
The first parameter is the matching character, the second parameter is how many to search for, -1 is to search for all
Go provides a very good way to directly extract the email name, email domain name, and email suffix, so what should be done!
You cannot continue to use the method in the above case here. You need to UseFindAllStringSubmatchThis method
In this method you can know that what is returned is a two-dimensional String. From the return result in the above figure, we can also know that what is returned is a two-dimensional string.
Since a two-dimensional string slice is returned, we can loop to obtain each extracted content.
You can see that four matches were returned, the first one is complete, and the following three are the content we obtained.
Passed The above four cases briefly understand how to use regular expressions in Go, simulated several scenarios, and used the regular expression package in Go.
This case can also be regarded as an exercise for go. It does not have much in-depth content. It is mainly about the use of regular packages. The most important thing is the last case. This kind of regular expression extracts content in the crawler project. is very common.
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When the user is sure that the input is completely consistent, it can be used.
