[pcre-dev] [Bug 2232] New: Whitespace after subpattern defin…

https://bugs.exim.org/show_bug.cgi?id=2232

            Bug ID: 2232
           Summary: Whitespace after subpattern definition seems to
                    disable backtracking
           Product: PCRE
           Version: 10.30 (PCRE2)
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Code
          Assignee: ph10@???
          Reporter: david.lanzenberger@???
                CC: pcre-dev@???

Consider the following pattern:

(?(DEFINE)(?<optional_a>a?))^(?&optional_a)a$

As expected (with the new PCRE2 10.30 subpattern backtracking), it matches the
subject strings "a" and "aa". However, if we insert a new line after the
definition of optional_a, the pattern matches only the string "aa":

(?(DEFINE)(?<optional_a>a?)
)^(?&optional_a)a$

As a workaround, one can use (?x) as follows:
(?(DEFINE)(?x)(?<optional_a>a?)
)^(?&optional_a)a$

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