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Some lookbehind assertions were accepted when they should not have been.

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Fixes #4309.

[SVN r62563]
This commit is contained in:
John Maddock
2010-06-08 12:41:41 +00:00
parent eaaf00a924
commit 528cf2abb9
2 changed files with 12 additions and 2 deletions
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8
include/boost/regex/v4/basic_regex_creator.hpp
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@ -1039,6 +1039,14 @@ int basic_regex_creator<charT, traits>::calculate_backstep(re_syntax_base* state
case syntax_element_jump:
state = static_cast<re_jump*>(state)->alt.p;
continue;
case syntax_element_alt:
{
int r1 = calculate_backstep(state->next.p);
int r2 = calculate_backstep(static_cast<re_alt*>(state)->alt.p);
if((r1 < 0) || (r1 != r2))
return -1;
return result + r1;
}
default:
break;
}