RegEx to wrap [ ] around text. For example when you need to turn a single JSON object into an array.

gistfile1.cs

///  A description of the regular expression:
///  
///  Beginning of line or string
///  [1]: A numbered capture group. [[^[].*[^]]]
///      [^[].*[^]]
///          Any character that is NOT in this class: [[]
///          Any character, any number of repetitions
///          Any character that is NOT in this class: []]
///  End of line or string

var regex = new Regex("^([^[].*[^]])$", RegexOptions.CultureInvariant | RegexOptions.Compiled);
var result = regex.Replace(replacements, "[$1]");