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suppress backref processing in ERE regcomp
one of the features of ERE is that it's actually a regular language and does not admit expressions which cannot be matched in linear time. introduction of \n backref support into regcomp's ERE parsing was unintentional.
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@ -839,7 +839,7 @@ static reg_errcode_t parse_atom(tre_parse_ctx_t *ctx, const char *s)
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s--;
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break;
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default:
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if (isdigit(*s)) {
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if (!ere && isdigit(*s)) {
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/* back reference */
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int val = *s - '0';
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node = tre_ast_new_literal(ctx->mem, BACKREF, val, ctx->position);
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