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

[Denis W. <ddw...@gm...>]

And another simple question.
Does JFlex support for the following kind of  variable character length
unicodes?

CHAR = \u9 | \uA | \uD | [\u20-\uD7FF] | [\uE000-\uFFFD] |
[\u10000-\u10FFFF]

Cherrs,
Dhananjaya

2009/11/29 Peter L. Bird <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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