Elektra
0.8.14
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This plugin is a check plugin which checks string values of Keys using regular expressions.
The validation plugin looks for two metakeys. check/validation
gives a regular expression to check against. If it is present, check/validation/message
may contain an optional humanly readable message that will be passed with the error information.
The implementation consists of a loop checking for every key if it has the mentioned metakey. The check itself is done by the POSIX regular expression library with the interface regcomp
, regexec
, regerror
and regfree
. The flag REG_EXTENDED
is passed so that the regular expression will be compiled as an extended regular expression. REG_NOSUB
gives a better performance and subexpressions cannot be used in this setup anyway.
The plugin also exports the function ksLookupRE()
that does a lookup in a KeySet using a regular expression. It starts from the current cursor of the KeySet and stops when the first value matches. Finally, this key is returned.