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Solved the annoying A1ert Error

As many of you know by now - if you type a1ert into a forum post (Note- I am using the number 1 in place of the lower case l) - then all the content after the aforesaid word is removed.

See the following Gemini Posts:

DNN-8220 DotNetNuke.PortalSecurity.FilterString truncates posts based on the word 'a1ert'

FOR-7206 Forums module: the word "a1ert" disapears in Forum posts and subject

DNN- 7215 Page names containing the word "a1ert" become uneditable in 4.8.2

The problem was that a Regex filter introduced as part of a Security fix to remove any potential use of the javascript a1ert function was too agressive.

The Regex was as follows:


The problem with this Regex is that after the t there is .* - the . indicates any character and the * indicates 0-n, so anytext after the offending word was also matched and removed.

The goal of the Regex is to remove use-cases where the word is used as javascript but NOT the normal use of the word.

After much fighting with Regex today - it is not my favourite language - I figured out the correct Regex to use:

a1ert[\s(nbsp; )]*\([\s(nbsp; )]*'?[\s(nbsp; )]*"?[\s( nbsp;)]*'?[\s(nbsp; )]*"?[\s(nbsp; )]*\)

The main change is to use \s (ie any white space) rather than . (any character). 

In addition we have to include the HTML Entity nbsp; (actually this is preceded by an & in the actual regex, but the editor displays this as a "space"  )  as possible white space as the FCK Editor will replace extra spaces by  .

Anyway - to cut a long story short, the new filter will trap

  • a1ert   (  )
  • a1ert  (  '  '  )
  • a1ert      ( "")

and any combination with variable whitespace (0-n).

but NOT  a1ert when used in a normal word.

As this is a long standing annoyance I have checked this into the 4.9.0 codebase so it will be fixed in the 4.9.0 Release.



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