import java.util.Arrays;

import java.util.regex.Pattern;

class EnvironmentSanitizer {

/**

* Sanitizes environment variable values.

*

* @param envVarValue The raw value of the environment variable.

* @return The sanitized value, or null if the input is invalid.

*/

public static String sanitize(String envVarValue) {

if (envVarValue == null || envVarValue.isEmpty()) {

return null; // Or an empty string "" if preferred

}

// Remove leading/trailing whitespace

envVarValue = envVarValue.trim();

// Sanitize: Allow only alphanumeric characters, underscores, and hyphens.

// This can be adjusted based on specific requirements.

Pattern pattern = Pattern.compile("^[a-zA-Z0-9_-]+$");

if (!pattern.matcher(envVarValue).matches()) {

return null; // Or throw an exception, log an error, etc.

}

return envVarValue;

}

public static void main(String[] args) {

//Example Usage

String rawValue1 = " my_variable-123 ";

String sanitizedValue1 = sanitize(rawValue1);

System.out.println("Raw: " + rawValue1 + ", Sanitized: " + sanitizedValue1);

String rawValue2 = "invalid_char@#$%";

String sanitizedValue2 = sanitize(rawValue2);

System.out.println("Raw: " + rawValue2 + ", Sanitized: " + sanitizedValue2);

String rawValue3 = null;

String sanitizedValue3 = sanitize(rawValue3);

System.out.println("Raw: " + rawValue3 + ", Sanitized: " + sanitizedValue3);

String rawValue4 = "";

String sanitizedValue4 = sanitize(rawValue4);

System.out.println("Raw: " + rawValue4 + ", Sanitized: " + sanitizedValue4);

}

}