📄 f_substr.ihlp
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{* 30nov2004}{...}
{phang}
{cmd:substr(}{it:s}{cmd:,}{it:n1}{cmd:,}{it:n2}{cmd:)} returns the
substring of {it:s} starting at {it:n1} for a length of {it:n2}. If
{it:n1}<0, the starting position is interpreted as distance from the
end of the string. If {it:n2} is {it:missing} ({hi:.}),
the remaining portion of the string is returned.{p_end}
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