Bug | Illegal RegExp in Safari in 3.0.0-beta.1 and beta.2

[nambiarAswathi]

Since the upgrade from 3.0.0-alpha6 to beta2, there is an issue on old Safari versions. The Html widget renders as a grey area and and the console the error is:

FormatException: Illegal RegExp pattern (SyntaxError: Invalid regular expression: invalid group specifier name)
(?<=\n) *

[Sub6Resources]

Thanks for the contribution. Whitespace bugs are among the most common issues reports I receive, so let me write a few unit tests to verify that this RegExp change still handles all the edge cases correctly. If so, then we can merge this, otherwise I'll probably have to write a custom code to handle these whitespace replacements to support Safari

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.07%. Comparing base (2814407) to head (231dfc5).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1444      +/-   ##
==========================================
- Coverage   64.08%   64.07%   -0.02%     
==========================================
  Files          39       39              
  Lines        3032     3031       -1     
==========================================
- Hits         1943     1942       -1     
  Misses       1089     1089              

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