Code Inspection: Redundant character escape
Reports character escapes that are replaceable with the unescaped character without a change in meaning. Note that inside the square brackets of a character class, many escapes are unnecessary that would be necessary outside of a character class.
After the quick-fix is applied:
New in 2017.3
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Position 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.