https://bugs.exim.org/show_bug.cgi?id=2690
Bug ID: 2690
Summary: Discontinuous behavior with parsing of backslash
followed by number
Product: PCRE
Version: 10.36 (PCRE2)
Hardware: All
OS: All
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: philip.ha...@gmail.com
Reporter: david...@earthling.net
CC: pcre-dev@exim.org
The pattern /\214748363/ is interpreted by parsing the first three digits as
octal and treating the remaining digits as literal numerals, i.e.
/\x{8c}748363/. But with /\214748364/ or any integer 2^31/10 or larger, PCRE2
returns the error "subpattern number is too big".
PCRE1 behaves slightly differently, with /\2147483639/ being parsed as
/\x{8c}7483639/, but /\2147483640/ returning the error "number is too big".
Perl does not do this; it treats the first three digits as an octal character
code, followed by literal interpretation of the remaining numerals, regardless
of how big of a decimal number follows a backslash. For example /\10000000000/
is treated as /@00000000/. PCRE2 should do the same.
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