


For programmers who are developing using Go language, compilation errors are commonplace. One of the common errors is: "undefined: regexp.MustCompile". This error usually occurs when trying to use the MustCompile
function in your code while using the regexp
package. This article will briefly describe the causes and solutions to this error.
Error reason
By default, the regexp
package of Go language does not export the MustCompile
function. This function is a method provided by the Regexp
structure, so before using the MustCompile
function, you need to use a regular expression and compile it into the Regexp
structure . This structure contains information about the regular expression, such as the pattern string and matching options.
If you use the regexp.MustCompile
function directly in your code, the Go compiler will throw an "undefined" error because the function is not actually in the regexp
package in the top-level namespace. In other words, the compiler cannot find the definition of the function.
Solution
To solve this problem, you need to pass the regular expression string to be compiled to the Compile
method of the Regexp
structure. The Compile
method returns a pointer of type *Regexp
, which contains compiled regular expression information.
To make the code more concise, you can use a variant of the regexp.MustCompile
function, as shown below:
func MustCompile(str string) *Regexp { regexp := Compile(str) if regexp == nil { panic("regexp: Compile(" + quote(str) + ") failed") } return regexp }
This function accepts a string as a parameter, and It compiles to a regular expression and returns a pointer of type *Regexp
. If compilation fails, it will throw a panic.
So, if you want to use the regexp.MustCompile
function, just call it like this:
regex := regexp.MustCompile(`(?i)hellos+(w+)`)
Here, string "(?i) hellos (w )"
is the regular expression you want to compile. In this example, we use (?i)
to match case-insensitive, hello
to match the literal text "hello", and s
to match one or more space characters, (w)
means matching one or more alphanumeric characters.
In short, if you encounter this "undefined: regexp.MustCompile" compilation error, please use the Compile
method or the MustCompile
function to compile regular expressions. , and stores its compilation result in a variable of type *Regexp
.
The above is the detailed content of golang compilation error: 'undefined: regexp.MustCompile' How to solve it?. For more information, please follow other related articles on the PHP Chinese website!

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