Documentation
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Reference
Preferences
Editing Options
Private Editing Options->{...}
AutoStyleOptions
"UnmatchedBracketStyle"
• "UnmatchedBracketStyle" is an option for notebooks that determines if unmatched brackets are displayed in a special color.
• With the default setting, "UnmatchedBracketStyle" 
"UnmatchedBracket", unpaired brackets are displayed in purple color. This enables them to be easily distinguished from the surrounding text, for purposes of editing code. However, for this special style to be used, the option ShowAutoStyles must be set to True.
• With the setting "UnmatchedBracketStyle" None, unpaired brackets have the same color as the surrounding text.
• See also: ShowAutoStyles.
