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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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16688>
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