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Clarification of format

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commit 360b684256d2922809ee1a2bda2d8a88e58fc58f 1 parent cb597e5
David R. MacIver authored
Showing with 1 addition and 1 deletion.
  1. +1 −1  README.markdown
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2  README.markdown
@@ -4,7 +4,7 @@ It accepts input from STDIN, where each line of input is of the form
identifier1 identifer2 ... identifiern
-These are required to be separated with spaces, not tabs.
+Valid identifiers are of the form [A-Za-z0-9_]+. i.e. contain only alphanumeric characters and underscores. Identifiers are required to be separated with spaces, not tabs.
Currently it is an error to repeat an identifier more than once on a line, but this is not validated. Either of validation or a sensible interpretation may be provided later.
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