Use regular expressions in golang to verify whether the input is an HTML escape character

Golang is a powerful programming language that can handle many types of data. When processing HTML code, it is often necessary to perform certain verification on the input content, including verifying whether it is an HTML escape character.

HTML escape characters are to replace characters with special meanings in HTML code into corresponding character entities, such as replacing the less than sign "<" with "<" to prevent them from being regarded as HTML tags by the browser. be explained. However, some malicious users may enter entity characters directly into the input box. At this time, the input content needs to be verified to ensure website security.

The following will introduce how to use regular expressions in golang to verify whether the input is an HTML escape character.

1. Create a regular expression

In order to verify whether the input is an HTML escape character, you can first create a regular expression to match entity characters.

pattern := `(&#?[a-zA-Z0-9]+;?)`
regex := regexp.MustCompile(pattern)

The above regular expression can match the following types of entity characters:

&
©
<

Among them, "&#" can be followed by any number or entity name (for example, "lt" represents less than Number).

2. Verify whether the input complies with the regular expression rules

You can now match the entered value with the regular expression to see if it complies with the rules.

input := "abc<"
if regex.MatchString(input) {
    fmt.Println("输入符合规则")
} else {
    fmt.Println("输入不符合规则")
}

The following output can be obtained:

输入符合规则

If the input value contains HTML escape characters, you can see the output "Input conforms to the rules", otherwise the output "Input does not conform to the rules".

Summary

When using golang to process HTML code, verifying whether the input is an HTML escape character is an important security issue. By using regular expressions, you can easily determine whether there are entity characters in the input, thereby ensuring the security of the website. In practical applications, you also need to pay attention to escaping input content to prevent XSS attacks from occurring.

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