[issue16688] Backreferences make case-insensitive regex fail on non-ASCII strings.
Matthew Barnett
report at bugs.python.org
Sat Dec 15 01:41:26 CET 2012
Matthew Barnett added the comment:
In function SRE_MATCH, the code for SRE_OP_GROUPREF (line 1290) contains this:
while (p < e) {
if (ctx->ptr >= end ||
SRE_CHARGET(state, ctx->ptr, 0) != SRE_CHARGET(state, p, 0))
RETURN_FAILURE;
p += state->charsize;
ctx->ptr += state->charsize;
}
However, the code for SRE_OP_GROUPREF_IGNORE (line 1316) contains this:
while (p < e) {
if (ctx->ptr >= end ||
state->lower(SRE_CHARGET(state, ctx->ptr, 0)) != state->lower(*p))
RETURN_FAILURE;
p++;
ctx->ptr += state->charsize;
}
(In both cases 'p' is of type 'char*'.)
The problem appears to be that the latter is still using '*p' and 'p++' and is thus always working with chars (it gets and advances 1 byte at a time instead of 1, 2 or 4 bytes for Unicode).
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<http://bugs.python.org/issue16688>
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