Polynomial Sequences part 2 by I., S.(RegExp)

rxrplc 1 :0;._2 stdin load'regex'
wd('1?x(.1)?';'x')u('^ \+?|x.0';'')u,(*@|#(' +-'{~0,.*),.":@|,.#('x^',":)@-#\)(%.#\^/#-#\)x:_".y
)

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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