Re: [gobo-eiffel-develop] Regular expression syntax

[Eric B. <er...@go...>]

Colin Paul Adams wrote:
> Does anyone know the details of the regular expression syntax matched
> by class RX_PCRE_REGULAR_EXPRESSION?
> 
> It's baffling me.
> 
> For instance, the following regular expression:
> 
> ^[abc]*$
> 
> fails to compile, but
> 
> ^[abc]*
> 
> compiles OK.

I wrote the following test and it works:

	test_compile1 is
			-- Test feature 'compile'.
		local
			a_regexp: RX_PCRE_REGULAR_EXPRESSION
		do
			create a_regexp.make
			a_regexp.compile ("^[abc]*$")
			assert ("compiled1", a_regexp.is_compiled)
			assert ("recognizes1", a_regexp.recognizes ("aaabbbccc"))
			assert ("not_recognizes1", not a_regexp.recognizes ("aaabbbcccddd"))
		end

So I don't know why it would not work for you.

> I don't have great hopes of trying to get this to compile:
> 
> ^[\i-[:]][\c-[:]]*$
> 
> (that's XPath regular expression syntax, derived from XML Schema - \i
> and \c are all initial name characters and all name characters
> respectively.)

I think that would have to write a preparser that would
translate XPath regular expressions into PCRE regular
expressions.

-- 
Eric Bezault
mailto:er...@go...
http://www.gobosoft.com