Using a Regexp in String#gsub in C

ruby-talk
1

Hi,

I've got some code in C that makes a call to String#gsub via rb_funcall

VALUE pattern = rb_str_new2(" ");
VALUE heading = rb_funcall(str, rb_intern("gsub"), 2, pattern,
rb_str_new2("-"));

I'd like to get pattern to be a Regexp object so that I can replace
repeating whitespace, but the various things I've tried so far haven't
worked. I've tried:

VALUE pattern = rb_str_new2("/\\s\\+/");

and

VALUE pattern = RREGEXP(rb_str_new2("\\s\\+"))'

Would someone out there be able to help me out with this?

Thanks

···

--
Matt

2

You can create the string first (without slashes), then create the regexp using the string, finally call gsub as usual, passing the regexp value.

For example:

  VALUE pattern = rb_str_new2("some-pattern");
VALUE regex = rb_reg_new_str(pattern, 0);

Hope that helps,
Ammar

···

On Aug 1, 2013, at 1:03 AM, Matt Rogers <mattrogers@sbcglobal.net> wrote:

Hi,

I've got some code in C that makes a call to String#gsub via rb_funcall

VALUE pattern = rb_str_new2(" ");
VALUE heading = rb_funcall(str, rb_intern("gsub"), 2, pattern,
rb_str_new2("-"));

I'd like to get pattern to be a Regexp object so that I can replace
repeating whitespace, but the various things I've tried so far haven't
worked. I've tried:

VALUE pattern = rb_str_new2("/\\s\\+/");

and

VALUE pattern = RREGEXP(rb_str_new2("\\s\\+"))'

Would someone out there be able to help me out with this?

Thanks
--
Matt

3

Perfect, thanks!

···

On Thu, Aug 1, 2013 at 1:58 PM, Ammar Ali <ammarabuali@gmail.com> wrote:

You can create the string first (without slashes), then create the regexp
using the string, finally call gsub as usual, passing the regexp value.

For example:

  VALUE pattern = rb_str_new2("some-pattern");
VALUE regex = rb_reg_new_str(pattern, 0);

Hope that helps,
Ammar

--
Matt

On Aug 1, 2013, at 1:03 AM, Matt Rogers <mattrogers@sbcglobal.net> wrote:

Hi,

I've got some code in C that makes a call to String#gsub via rb_funcall

VALUE pattern = rb_str_new2(" ");
VALUE heading = rb_funcall(str, rb_intern("gsub"), 2, pattern,
rb_str_new2("-"));

I'd like to get pattern to be a Regexp object so that I can replace
repeating whitespace, but the various things I've tried so far haven't
worked. I've tried:

VALUE pattern = rb_str_new2("/\\s\\+/");

and

VALUE pattern = RREGEXP(rb_str_new2("\\s\\+"))'

Would someone out there be able to help me out with this?

Thanks
--
Matt

4

Why not just use rb_reg_new ?

10003 % ag rb_reg_new include/
include/ruby/intern.h
635:VALUE rb_reg_new_str(VALUE, int);
636:VALUE rb_reg_new(const char *, long, int);

···

On Aug 1, 2013, at 11:58 , Ammar Ali <ammarabuali@gmail.com> wrote:

You can create the string first (without slashes), then create the regexp using the string, finally call gsub as usual, passing the regexp value.

For example:

  VALUE pattern = rb_str_new2("some-pattern");
VALUE regex = rb_reg_new_str(pattern, 0);

5

That's even better. Thanks!

···

On Thu, Aug 1, 2013 at 3:41 PM, Ryan Davis <ryand-ruby@zenspider.com> wrote:

On Aug 1, 2013, at 11:58 , Ammar Ali <ammarabuali@gmail.com> wrote:

You can create the string first (without slashes), then create the regexp using the string, finally call gsub as usual, passing the regexp value.

For example:

  VALUE pattern = rb_str_new2("some-pattern");
VALUE regex = rb_reg_new_str(pattern, 0);

Why not just use rb_reg_new ?

10003 % ag rb_reg_new include/
include/ruby/intern.h
635:VALUE rb_reg_new_str(VALUE, int);
636:VALUE rb_reg_new(const char *, long, int);

--
Matt