[thelist] Regular expression to check if other regularexpressions are valid

[VOLKAN ÖZÇELİK]

try {
   eval("preg_match('/badregex', 'asdfasf');");
}
catch(exception) {
  alert("bad reg ex");
}

will do it for JS.

However what we are thinking (at least what I am thinking) is something like

/bad regex**/
----------------^ (the arrow points the second asterix)

which will indicate the character position of the error.

This can only be done by checking the syntax of regex (with a reg ex,
with a recursive programming logic, with some other logic) imo.

Cheers,
Volkan

On 6/23/05, lustig at brandeis.edu <lustig at brandeis.edu> wrote:
> > If eval is available in your language of choice you can
> > use it to test the validity of a regex.
> 
> But if you just eval the regular expression, like this (in php)
> 
> eval("preg_match('/badregex', 'asdfasf');");
> 
> ... then wouldn't it just throw an error as if you ran the code natively? In
> my experience, eval() doesn't suppress errors.
> 
> Jason
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