<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 letter from A - Z. Matches a control character in a string.
\xhh Matches the character with the code hh (two hexadecimal digits).
\uhhhh Matches the character with code hhhh (four hexadecimal digits).
