multiple lines declaration

[sam]

Hi,

The following multiple lines declaration failed.
How can I declare it in C/C++ syntax?

string regex_parser =
"(go)\ +on\ +\$(\S+) // keyword (1) ext_if (2)
\ +from\ +\$(\S+) // int_net (3)
\ +to\ +\$(\S+) // dest(any) (4)
\ +->\ +\(\$(\S+)\)$";
the error is:
myparser.cpp:9: error: missing terminating " character
myparser.cpp:10: error: stray '\' in program
myparser.cpp:10: error: stray '\' in program
....

where line #9 is "(go)\ +on\ +\$(\S+)"

Thanks
Sam

[Victor Bazarov]

sam wrote:

The following multiple lines declaration failed.
How can I declare it in C/C++ syntax?

string regex_parser =
"(go)\ +on\ +\$(\S+) // keyword (1) ext_if (2)
\ +from\ +\$(\S+) // int_net (3)
\ +to\ +\$(\S+) // dest(any) (4)
\ +->\ +\(\$(\S+)\)$";
the error is:
myparser.cpp:9: error: missing terminating " character
myparser.cpp:10: error: stray '\' in program
myparser.cpp:10: error: stray '\' in program
...

where line #9 is "(go)\ +on\ +\$(\S+)"

String literals shall not contain newline characters. Close
every line with a double quote and the parts will be concatenated:

string regex_parser =
"one part" // some comment
"other part";

V

[Andre Caldas]

By the way,

string regex_parser =
"(go)\ +on\ +\$(\S+) // keyword (1) ext_if (2)
\ +from\ +\$(\S+) // int_net (3)
\ +to\ +\$(\S+) // dest(any) (4)
\ +->\ +\(\$(\S+)\)$";

The charactere \ is a escape charactere. You need to write \\ if you
want it to be on the string.

[sam]

Andre Caldas wrote:

By the way,

string regex_parser =
"(go)\ +on\ +\$(\S+) // keyword (1) ext_if (2)
\ +from\ +\$(\S+) // int_net (3)
\ +to\ +\$(\S+) // dest(any) (4)
\ +->\ +\(\$(\S+)\)$";

The charactere \ is a escape charactere. You need to write \\ if you
want it to be on the string.

I have added " and \ to fix the problem, but still haven't tried a real
example yet. I hope this parser works as it supposed to be.

Thanks
Sam