In GoLang, checking for special characters within a string requires specific methods. When encountering a string obtained from user input, ensuring its validity often necessitates verifying the absence of malicious or undesirable characters. This article explores two approaches to detect special characters in strings.
The strings.ContainsAny() function determines whether a string contains any character from a provided set of characters. To check for special characters, pass the string and a special character set to the function. For instance:
<code class="go">package main import "strings" func main() { fmt.Println(strings.ContainsAny("Hello World", ",|")) // false fmt.Println(strings.ContainsAny("Hello, World", ",|")) // true fmt.Println(strings.ContainsAny("Hello|World", ",|")) // true }</code>
For checking if a string contains non-ASCII characters, strings.IndexFunc() proves useful. It returns the index of the first character that satisfies a provided function. Pass a function that checks if the character is outside the ASCII character range:
<code class="go">package main import ( "fmt" "strings" ) func main() { f := func(r rune) bool { return r < 'A' || r > 'z' } if strings.IndexFunc("HelloWorld", f) != -1 { fmt.Println("Found special char") // false } if strings.IndexFunc("Hello World", f) != -1 { fmt.Println("Found special char") // true } }</code>
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