-O, --lenient sets the regcomp(3) REG_LENIENT flag
in general if REG_LENIENT is on then certain constructs marked
"unspecified" in the standard will be accepted, otherwise they
may produce regcomp(3) errors
e.g.
invalid \char escape
grep -S '\#' <<<'#'
invalid [...] range endpoint
grep -S '[a-q-z]' <<<'a'
the intention (theory) is that RE's that make it through -S, --strict
will make it through all conformant implementations
as counterexamples roll in I tweak libast/reg*.c to make pratice match theory
On Thu, 4 Mar 2010 15:51:05 +0100 =?KOI8-R?B?z8zYx8Egy9LZ1sHOz9fTy8HR?= wrote:
> What is the difference between lenient (-O) and strict pattern (-S)
> interpretation in AST grep?
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