Re: Hex character ranges

[Raman Muthukrishnan]

Flex allows only single character ranges. From the flex man page:

           [xyz]      a "character class"; in this case, the pattern
                        matches either an 'x', a 'y', or a 'z'
           [abj-oZ]   a "character class" with a range in it; matches
                        an 'a', a 'b', any letter from 'j' through 'o',
                        or a 'Z'
Note the description of 'j' through 'o'.

So you can also give [\x01-\xFF] as a character range; but [\x01\x02-\x0f\xff] will be interpreted as match for \x01, or match for any char in the range \x02 to \x0f or match char \xFF.

address@hidden wrote:

From: address@hidden
Subject: Hex character ranges
To: help-flex
Message-ID:
<address@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Greetings,

According to the documentation, it is possible to specify a hex
character to match using '\x' such in '\x2a'. I was curious if it was
possible to use hex ranges in such _expression_, like matching \x20a0 to
\x20cf. If so, can you use some compound logic to make a defintion,
such as
SYMBOL \x092f|\x0e3f|[\x20a0-\x20cf]

If this isn't possible, please suggest possible work arounds.

Thanks for taking the time to read this,
Matt




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