MonoDevelop crashes when some text typed in Regular expression window

[YTKowshik]

MonoDevelop version : 7.8.4(build 2)
OS : Kali 5.10
Steps to Reproduce:

1. Open MonoDevelop
2. Click Tools
3. Select Regular Expressions Toolkit
4. Enter some text in Input

When typing a text, the app closes by itself. This happens all the times.

[YTKowshik]

Screencast.2021-03-07.22.08.58.mp4

[JohnyM01]

Hi,
I have the same problem. Some times it did not crash but tend to lock up the program. Very annoying. Then it generates a crash file in JSON format.

I am using MonoDevelop ver 7.8.4 (Build 2) in Ubuntu 18.04

In the mean time, I have been using online regular expression toolkit resources:
https://regexlib.com/RETester.aspx?AspxAutoDetectCookieSupport=1
http://regexstorm.net/tester

They are very solid replacement of the Toolkit packaged in MonoDevelop. Please fix this up.

Johny