ALPHA
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... TCHAR = VCHAR / SP / HTAB ; visible plus white space
RCHAR = ALPHA / DIGIT / "," / "." / ":" / "!" /
"@" / "#" / "$" / "%" / "^" /
...
... represented in any case. That is, "MDTM" is the same as "mdtm",
"Mdtm" and "MdTm" etc. However note that ALPHA, in particular, is
case sensitive. That implies that a "token" is a case sensitive
...
