Code Inspection: Redundant character escape
Reports redundant character escape sequences that can be replaced with unescaped characters preserving the meaning. Many escape sequences that are necessary outside of a character class are redundant inside square brackets
 of a character class.
Although unescaped opening curly braces
After the quick-fix is applied:
The Ignore escaped closing brackets '}' and ']' option specifies whether to report
\] outside of a character class when they are allowed to be unescaped by the RegExp dialect.
New in 2017.3
Suppress an inspection in the editor
Place the caret at the highlighted line and press Alt+Enter or click .
Click the arrow next to the inspection you want to suppress and select the necessary suppress action.