Re: [jflex-users] Syntax error for a regex rule

[Peter L. B. <pb...@co...>]

You need to escape your quote characters.  Try this:

VALUE = '\"' ([^<&\"] | [0-9])* '\"' |  "\'" ([^<&\'] | [0-9])* "\'"

personally, i find the following more readable:

VALUE = ([\"] ([^<&\"] | [0-9])* [\"]) | ([\'] ([^<&\'] | [0-9])* [\'])


Unless i'm mistaken, your inner patterns are redundant.  That is, the 
numeric characters[0-9]are part of the set specified in[^<&\"] (or 
[^<&\']).  The rewrite would look like:

VALUE = ('\"' [^<&\"]* '\"') | ("\'" [^<&\']* "\'")

cheers,

peter bird

At 09:21 AM 11/29/2009, Denis Weerasiri wrote:
>Hi folks,
>I'm new to JFlex and regex.
>I get a syntax error when generate using .flex file. My .flex is sm 
>thing like as follows.
>
>%%
>VALUE = '"' ([^<&"] | [0-9])* '"' |  "'" ([^<&'] | [0-9])* "'"
>%%
>{VALUE}                      { return symbol(sym.VALUE); }
>
>
>I get an error message as follows.
>
>Reading "/home/hdd2/Acedemic/L4-S1/CS4410-CompTheory/project/Tokenizer.flex"
>
>Error in file 
>"/home/hdd2/Acedemic/L4-S1/CS4410-CompTheory/project/Tokenizer.flex" 
>(line 54):
>Syntax error.
>
>VALUE = '"' ([^<&"] | [0-9])* '"' |  "'" ([^<&'] | [0-9])* "'"
>                            ^
>
>Error in file 
>"/home/hdd2/Acedemic/L4-S1/CS4410-CompTheory/project/Tokenizer.flex" 
>(line 54):
>Unterminated string at end of line.
>
>VALUE = '"' ([^<&"] | [0-9])* '"' |  "'" ([^<&'] | [0-9])* "'"
>                                                               ^
>2 errors, 0 warnings.
>
>Generation aborted.
>
>Can anyone give me a clue to solve this?
>
>Best,
>Dhananjaya.
>
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