• regular expression 1 character escapes
1. Characters used as operators should be escaped.
<JavaScript> $ ( ) * + . ? [ \ ] ^ { | }
2. Some control characters can be used with escapes.
<JavaScript> \0, [\b], \f, \n, \r, \t, \v
3. General Escapes.
<JavaScript>
\cX Where X is a lett ...
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