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
Ignore escaped closing brackets '}' and ']'
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