Made the grammer fit the README description more and it seems to work the same. Tests in other projects confirmed, but may need to watch it.

lel_parser.cpp

@@ -7,7 +7,7 @@
 namespace lel {
 
 
-#line 40 "lel_parser.rl"
+#line 41 "lel_parser.rl"
 
 
 
@@ -84,7 +84,7 @@ static const int Parser_error = 0;
 static const int Parser_en_main = 1;
 
 
-#line 43 "lel_parser.rl"
+#line 44 "lel_parser.rl"
 
 bool Parser::parse(std::string input) {
   reset();
@@ -101,7 +101,7 @@ bool Parser::parse(std::string input) {
 	cs = Parser_start;
 	}
 
-#line 54 "lel_parser.rl"
+#line 55 "lel_parser.rl"
   
 #line 94 "lel_parser.cpp"
 	{
@@ -246,7 +246,7 @@ _again:
 	_out: {}
 	}
 
-#line 55 "lel_parser.rl"
+#line 56 "lel_parser.rl"
 
   bool good = pe - p == 0;
   if(good) {

lel_parser.rl

@@ -33,8 +33,9 @@ namespace lel {
   number =  digit+ >{ start = fpc; } %token;
   setw = ("(" number %setwidth ("," number %setheight)? ")") ;
   modifiers = (percent | center | expand | valign | halign | setw);
-  id = modifiers* ((alpha | '_')+ :>> (alnum | '_')*) >{start = fpc;} %id;
+  id = ((alpha | '_')+ :>> (alnum | '_')*) >{start = fpc;} %id;
-  row = space* ltab space* id space* (col space* id space*)* space* rtab space*;
+  cell = modifiers* id;
+  row = space* ltab space* cell space* (col space* cell space*)* space* rtab space*;
 
   main := row+;
 }%%