Migrated first 6 gists.

rmfen.l/README.md

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+Flex lexer for rithmomachia boards represented in reduced modified FEN notation.

rmfen.l/rmfen.l

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+%{
+#include <stdio.h>
+%}
+
+%option outfile="rmfen.c"
+%option always-interactive
+%option nounput noinput
+
+space      [1-7]
+piece      (c|s|t|C|S|T)([1-9][0-9]{0,2})"."
+pyramid    (p|P){piece}+"."
+boardpiece ({pyramid}|{piece})
+row        (({space}|{boardpiece}){0,7}{boardpiece})?
+board      ({row}"/"){15}{row}
+
+%%
+
+{board} { printf("Valid board: %s\n", yytext); }
+
+. { printf("Unknown text %s\n", yytext); }