"Your edit must be at least X characters" is problematic at Code Golf
62451
How to overcome "Edits must be at least 6 characters"
97182
Where's my invalid character (ORA-00911)
114289
Only allowing up to three digit numeric characters in a text box
25963
Gaming the edit system with tiny edits?
104696
Where are the necessary places to be appended with % to remove unwanted spaces?
107307
Can I protect against SQL injection by escaping single-quote and surrounding user input with single-quotes?
96946
I'm getting "Your post appears to contain code that is not properly formatted as code" when there isn't any code in the post
121648
"Too many math alphabets" error
14171
Cannot insert character '≤' in SQL Server 2008
44451
Link button in post editor escapes square brackets in code
58078
Why is the comma splice an error?
97311
Cannot use Alt code for Unicode character insertion any more
84411
How to prevent invalid characters from being typed into input fields
131854
How to fix a single character typo in a code sample?
80151
Reference style links validating as improperly formatted code
59216
Is form charset required?
130505
some \newcommand instructions not working