FindReplace Regular Expression

Using the RegularExpression option doesn't allow me to use empty string in the ReplaceText field, the editor will crash.

Error message: No regular expression was located.

Field values:
ChangeSelection: true
FindText: "^\\s*"
MatchCase: false
MatchWholeWord: false
Modified: false
ReplaceText: ""
SearchHiddenText: true
SearchInSelection: true
SearchType: RegularExpression
SearchUp: false