Field Configuration: Naming Convention

Following is the standard convention to note while creating new fields in Hawksearch:

Only alphanumeric characters and the underscore are allowed in the fieldname
All characters are lowercase
Spaces must be replaced by underscores '_'
Underscore cannot be at the beginning or end of the name
Atleast one character is required
Atleast one number is required - an “n” will be appended to it

C# code block for your reference as below:

public static string GetStandardFieldName(string InputField)
{
    var rgx = new System.Text.RegularExpressions.Regex("[^a-zA-Z0-9_]");

    string SField = InputField;
    SField = SField.Replace(" ", "_");
    SField = rgx.Replace(SField, "");

    if (!string.IsNullOrEmpty(SField))
    {
        SField = SField.ToLower();
        if (SField.StartsWith("_"))
            SField = SField.Remove(0, 1);
        if (SField.EndsWith("_"))
            SField = SField.Remove(SField.Length - 1);
    }

    if (!string.IsNullOrEmpty(SField))
    {
        if(int.TryParse(SField.Substring(0, 1), out int result))
            SField= "n" + SField;
    }

    return SField;
}

Examples:

GetStandardFieldName("Hello, world!") 
GetStandardFieldName("99Hello, world!") 
GetStandardFieldName("_1Hello, world!_")

Outputs:

hello_world
n99hello_world
n1hello_world