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How to fix: Unescaped left brace error from Perl

In 2019, a Perl update contained a change that broke some Encodable apps like FileChucker and UserBase.  Installations that worked fine before would suddenly start displaying errors like this:

Unescaped left brace in regex is illegal here in regex; marked by <-- HERE in m/%PREF{ <-- HERE (\w+)}/ at filechucker.cgi line 2011.

This issue is fixed in the latest version of FileChucker (and will be fixed soon in UserBase), so you may want to get the update.

Or, if you want to fix your existing installation, you can do that instead.  First, make a backup copy of the script in question, e.g. filechucker.cgi or userbase.cgi.  Then open the file in a text editor and go to the line number given in the error message.  For example:

$PREF{after_upload_redirect_to} =~ s/%PREF{(\w+)}/$PREF{$1}/g;

The problem there is as explained in the error message: the "{" character in "%PREF{(\w+)}".  The fix is to "escape" that character, by putting a backslash before it.  And you'll need to escape the right brace too.  The fixed line is:

$PREF{after_upload_redirect_to} =~ s/%PREF\{(\w+)\}/$PREF{$1}/g;

NOTE: you must not escape all the braces on the line.  The ones before the "=~" must remain unescaped.  And the ones in the second half of the regex must also remain unescaped.  The regex is the "s/.../.../g" part.  Notice it has a first half (near the s) and a second half (near the g) separated by a slash in the middle.  You must only change the first half.

After you've fixed this line, upload your fixed file to your website, and reload the page in your browser.  You should now see the same error again, but this time referencing a different line.  There are about 15-20 lines like this that need to be fixed.

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I looked all over trying to find a simple cgi script.  I found that FileChucker was by far the best.  If you have issues with your hosting service's php.ini max upload size then this is the way to go.  Looking forward to future enhancements.
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You've done a wonderful job with FileChucker and UserBase, and they have made a big difference to how our website runs.
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The amount of customization in the program is incredible.  I was able to integrate it into my existing page layout relatively simply.  I was also able to easily customize the look/feel to match the current site.
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Why didn't I just do this from the get-go?  So much easier.  Thanks for your work.  FileChucker makes my work easier.
– Dominic M.
FileChucker is helping drive the backend of several high profile entertainment sites for people like Shania Twain and Dolly Parton.  We're also using it to drive backend file uploads for a multi-billion dollar banking institution.  It's a great product.  We've tried other "chucking" upload solutions with progress bars using flash and php, but nothing works as reliably as FileChucker.
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Nice script, it's saving the day on our project.
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I just installed the demo of your product and got it up and running in no time.  I searched high and low for a decent login script and thank God I found yours.
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Thank you VERY much for all of your help.  You've really impressed me.  We have support agreements for other software that costs thousands of dollars / year (just for the support), and most of them aren't as helpful as you have been.
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FileChucker is a great drop-in solution for file uploads, and worth every penny of its very reasonable cost.  Encodable's support is excellent to boot.
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Our members think your software is fantastic...  I would recommend your software and your company to anyone.  Thanks for all your help.  It has been a pleasure dealing with you.
– Tommy A.
I just wanted to say that yours is the first product that I've tested so far that hasn't failed on handling uploads.  This is going to work for a print company, so they are handling nothing but large files and all the other solutions I've tried so far have not been reliable.  So far yours has been 100% successful in my tests.
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