help on regular expressions

PHP:

Try this:

.*in %f on line %l

GCC:

PN actually has built-in support for GCC error parsing, but this is currently broken in 2.0.9 as I need to change the regexes for the new engine.

To use .9 currently, it’s easy enough to fix the regex. The one you reference above expands to this:

(?P<f>.+)?P<l>[0-9]+)(?P<c>[0-9]+)? .*

Note that the following expansions are done:

%f = (?P<f>.+)

%l = (?P<l>[0-9]+)

%c = (?P<c>[0-9]+)

Regular expressions are by default “greedy” which means they’ll take as many characters for each match as they can. Because the last match bit is optional, the first reference to [0-9]+: ends up using the last number and colon (so the line number field matches the column in the string). The filename then includes the line number.

Results from your example:

File: Test.cpp:7

Line: 17

Col:

If we make the filename match bit “non-greedy” then it will take as little of the string as it can. With Xpressive (the new regular expressions engine) we do this by adding a question mark to the filename bit:

(?P<f>.+?)?P<l>[0-9]+)(?P<c>[0-9]+)? .*

The results are now:

File: Test.cpp

Line: 7

Col: 17