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 | ^              REGEX METACHARS            REGEX MODIFIERS
 &&               ^     string begin         /i case insens.
...
 or xor           {1,2} amount           \w == [A-Za-z0-9_]
                  \b    word boundary    \d == [0-9] 
                  \z    string end       \S, \W and \D negate

 | ^              REGEX METACHARS            REGEX MODIFIERS
 &&               ^     string begin         /i case insens.
...
 or xor           |     alternation      \w == [A-Za-z0-9_]
                  \b    word boundary    \d == [0-9] 
                  \z    string end       \S, \W and \D negate