use of the yyleng function in ml-lex -

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could me out use of yyleng function of ml-lex. how use display length of length of matched text in analyser

(this question answered in comments. converted community wiki answer suit q&a format.)

@jesper.reenberg noted:

you might wan't rephrase question. not clear exact problem is. far know, have yypos , yytext in ml-lex. can take length of yytext length of matched.

see user guide, here or here examples.


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