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Mats Erik Andersson wrote:
| Hi folks,
|
| this is preliminary information that Busybox does
| not possess a full command of regular expression
| to the extent desirable for the 3.1 of Bering.
| I know for certain that this disturbs the validation
| I have implemented for Webconf, but those of you who
| rely on regular expressions in other subsystems of
| Bering ought to read the following exposition.
|
| The problem is that the regex handling in Busybox
| cannot correctly resolve repetitions using "\{n\}".
| The following is a reduction of the actual case
| that disturbs my validation of ip-addresses inside
| /var/webconf/lib/validator.sh.
|
| firewall# ### Matches exactly {0,...,25}
| firewall# tjugufem="\(1\?[0-9]\|2[0-5]\)"
| firewall# ### Should match "n-m-k", where n,m,k in {0,...,25}
| firewall# Trenne="$tjugufem\(-$tjugufem\)\{2\}"
| firewall#
| firewall# echo "25-19-25" | grep "^$Trenne$"
| 25-19-25
| firewall# echo "25-20-25" | grep "^$Trenne$"
| firewall#
Can you provide the exact sed code you're working with? I don't have
the validator.sh code handy to examine directly.
It looks like the regular expression you're passing to grep is:
~ $ echo "^$Trenne$"
~ ^\(1\?[0-9]\|2[0-5]\)\(-\(1\?[0-9]\|2[0-5]\)\)\{2\}$
For portability I would suggest directly crafting an extended regular
expression (rather than escaping all the extended metacharacters in a
standard regex). To gnu sed, the above and below are identical, but
they might not be to busybox. Try the following, as an extended
expression (ie: egrep or sed -r), and see if it's still buggy:
~ egrep '^(1?[0-9]|2[0-5])(-(1?[0-9]|2[0-5])){2}$'
...and try changing the location of the iterator to the first regex:
~ egrep '^((1?[0-9]|2[0-5])-){2}(1?[0-9]|2[0-5])$'
Minor glitches like this are why the old (2.2 based kernel) releases
used the 'real' sed. :)
- --
Charles Steinkuehler
[EMAIL PROTECTED]
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