How do I Detect and Verify Special Characters in Strings in GoLang?

How to Detect and Verify Special Characters in Strings in GoLang

In GoLang, there are various scenarios where you may need to determine the presence or absence of special characters within strings. Here's how to accomplish these tasks effectively.

Checking for Special Characters in a String:

To check if a string contains any special characters, you can employ the strings.ContainsAny function. This function takes two string arguments: the first is the string to be tested, and the second is a "special" string containing the special characters to look for. For instance:

package main

import (
    "fmt"
    "strings"
)

func main() {
    result := strings.ContainsAny("Hello, World", ",|")
    fmt.Println(result) // prints "true"
}

In this example, if the string Hello, World contains any of the characters from the special string ",|,", the ContainsAny function will return true.

Checking if a Character is Special:

If you need to verify whether a specific character is considered a special character, you can use the strings.IndexFunc function. This function takes two arguments: a string and a function that takes a rune (a single character) as input and returns a boolean indicating whether the rune is special. For example:

package main

import (
    "fmt"
    "strings"
)

func main() {
    f := func(r rune) bool {
        return r < 'A' || r > 'z'
    }
    result := strings.IndexFunc("Hello World", f)
    if result != -1 {
        fmt.Println("Found special char")
    }
}

In this example, the IndexFunc function checks each character in the string Hello World using the provided f function. If any character falls outside the ASCII range of 'A' to 'z', the f function will return true, and the IndexFunc function will return the index of that character. Otherwise, it will return -1 if no special characters are found.

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