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Re: Pattern matching

• To: mathgroup at smc.vnet.net
• Subject: [mg116572] Re: Pattern matching
• From: Alexey <lehin.p at gmail.com>
• Date: Sun, 20 Feb 2011 05:25:59 -0500 (EST)
• References: <ijo54e$lf0$1@smc.vnet.net>

On 19 =D1=84=D0=B5=D0=B2, 15:13, Leonid Shifrin <lshifr at gmail.com> wrote:
> Could do this:
>
> In[1]:= f[u] /. f[u + x : _ : 0] -> x
>
> Out[1]= 0
>
> Regards,
> Leonid

Is the form "x : _ : 0" a non-standard alternative to "x_."? Btw I
cannot find where this form is documented.