[Q] regular expressions change the 'substitue with' value

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V S P

26 Jun 2009 26 Jun '09

9:34 p.m.

Looking for some help with how to use regular expression library I have a string "!1!" I am replacing it with "\temp\i\otrq92rq40100__db1003.xls" ( a windows path to a file) This is how I am doing it std::string repl=subst_designator+ boost::lexical_caststd::string(counter)+ subst_designator; boost::algorithm::replace_all_regex(new_arg, boost::regex(repl),*res_it); Where: subst_designator = '!' counter = 1 new_arg = "!1!" *res_it="\temp\i\otrq92rq40100__db1003.xls" after the above code, the new_arg contains a strange string that appears to have back slashes removed and the first \t replaced with something like a 'tab' new_arg=" empiotrq92rq40100__db1003.xls" I am thinking that this is wrong, because the regular expression should copy without modifications the value of *res_it into the new_arg I am using 1.38 on windows with VS9. My question is , how can make it so the string in *res_it substitutes !1! thank you in advance, Vlad -- Vlad P author of C++ ORM http://github.com/vladp/CppOrm/tree/master -- http://www.fastmail.fm - IMAP accessible web-mail

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Steven Watanabe

26 Jun 26 Jun

9:59 p.m.

New subject: [Q] regular expressions change the 'substitue with' value

AMDG V S P wrote:

...

Looking for some help with how to use regular expression library

I have

a string

"!1!"

I am replacing it with

"\temp\i\otrq92rq40100__db1003.xls"

( a windows path to a file)

This is how I am doing it

std::string repl=subst_designator+ boost::lexical_caststd::string(counter)+ subst_designator;

boost::algorithm::replace_all_regex(new_arg, boost::regex(repl),*res_it);

Where:

subst_designator = '!' counter = 1 new_arg = "!1!" *res_it="\temp\i\otrq92rq40100__db1003.xls"

after the above code, the new_arg contains a strange string that appears to have back slashes removed and the first \t replaced with something like a 'tab' new_arg=" empiotrq92rq40100__db1003.xls"

I am thinking that this is wrong, because the regular expression should copy without modifications the value of *res_it into the new_arg

I am using 1.38 on windows with VS9.

My question is , how can make it so the string in *res_it substitutes !1!

With replace_all_regex, the string is not substituted literally. Can't you use replace_all instead of replace_all_regex? If you really need the search to use a regex, you can use find_format_all with regex_finder and const_formatter. In Christ, Steven Watanabe

V S P

11:24 p.m.

New subject: [Q] regular expressions change the 'substitue with' value

Thank you, replace_all forks for me now. But probably will need to go back to regular expression in the future. I do not think I need to search, I just need to replace (in-place) I assume the find_XXX functions do not do that. I might have misunderstood but if I have a string " something!1!else!1!ornot " and I want to replace !1! with a new replacement text "c:\temp\file.xls", isn't the replace_all_regex the correct function to use? if not, can you suggest an example with the combination of functions you have mentioned -------- thank you

...

With replace_all_regex, the string is not substituted literally. Can't you use replace_all instead of replace_all_regex? If you really need the search to use a regex, you can use find_format_all with regex_finder and const_formatter.

In Christ, Steven Watanabe

-- Vlad P author of C++ ORM http://github.com/vladp/CppOrm/tree/master -- http://www.fastmail.fm - mmm... Fastmail...

Steven Watanabe

11:54 p.m.

New subject: [Q] regular expressions change the 'substitue with' value

AMDG V S P wrote:

...

Thank you, replace_all forks for me now.

But probably will need to go back to regular expression in the future.

I do not think I need to search, I just need to replace (in-place) I assume the find_XXX functions do not do that.

I might have misunderstood but if I have a string

" something!1!else!1!ornot "

and I want to replace !1! with

a new replacement text "c:\temp\file.xls",

isn't the replace_all_regex the correct function to use?

No. replace_all_regex uses regex_formatter which is too fancy because the format strings behave as described in http://www.boost.org/libs/regex/doc/html/boost_regex/format.html

...

if not, can you suggest an example with the combination of functions you have mentioned

boost::find_format_all(s, boost::regex_finder("!1!"), boost::const_formatter("c:\temp\file.xls")) In Christ, Steven Watanabe

OvermindDL1

13 Jul 13 Jul

3:07 a.m.

New subject: [Q] regular expressions change the 'substitue with' value

On Fri, Jun 26, 2009 at 5:54 PM, Steven Watanabe wrote:

...

/* snip thread */

Out of curiosity, but this is C++, and is not a backslash in a string in C++ an escape character, hence things like "\temp\i\otrq92rq40100__db1003.xls" should actually be "\\temp\\i\\otrq92rq40100__db1003.xls", and since "\temp\i\otrq92rq40100__db1003.xls" was turning into "empiotrq92rq40100__db1003.xls", is that not correct since the backslashes were not escaped? Hence, this problem has *nothing* to do with Boost and everything to do with forgetting to escape the escape character? :)

V S P

7:25 a.m.

New subject: [Q] regular expressions change the 'substitue with' value

i do no think so, because escapes are only needed for strings in source files not the ones in memory in this particular instance the string came back from a call to a remote corba service and when you print it out to stdout it had the slashes. On Sun, 12 Jul 2009 17:07 -0600, "OvermindDL1" wrote:

...

On Fri, Jun 26, 2009 at 5:54 PM, Steven Watanabe wrote:

...
/* snip thread */

Out of curiosity, but this is C++, and is not a backslash in a string in C++ an escape character, hence things like "\temp\i\otrq92rq40100__db1003.xls" should actually be "\\temp\\i\\otrq92rq40100__db1003.xls", and since "\temp\i\otrq92rq40100__db1003.xls" was turning into "empiotrq92rq40100__db1003.xls", is that not correct since the backslashes were not escaped? Hence, this problem has *nothing* to do with Boost and everything to do with forgetting to escape the escape character? :) _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -- Vlad P author of C++ ORM http://github.com/vladp/CppOrm/tree/master

-- http://www.fastmail.fm - The way an email service should be

OvermindDL1

10 p.m.

New subject: [Q] regular expressions change the 'substitue with' value

On Mon, Jul 13, 2009 at 1:25 AM, V S P wrote:

...

i do no think so, because escapes are only needed for strings in source files not the ones in memory

in this particular instance the string came back from a call to a remote corba service and when you print it out to stdout it had the slashes.

Ah, did not get that impression from what you posted, this looks like C/C++ to me:

...

subst_designator = '!' counter = 1 new_arg = "!1!" *res_it="\temp\i\otrq92rq40100__db1003.xls" Meaning the last line would be the cause of the problems and would cause empiotrq92rq40100__db1003.xls to be emitted just like what you said that you saw.

V S P

14 Jul 14 Jul

5:18 a.m.

New subject: [Q] regular expressions change the 'substitue with' value

I just copied the data from the debugger and put it like it is assigned to variables so that I could show the issue I am having :-) Which got resolved by Steve W. On Mon, 13 Jul 2009 12:00 -0600, "OvermindDL1" wrote:

...

On Mon, Jul 13, 2009 at 1:25 AM, V S P wrote:

...
i do no think so, because escapes are only needed for strings in source files not the ones in memory

in this particular instance the string came back from a call to a remote corba service and when you print it out to stdout it had the slashes.

Ah, did not get that impression from what you posted, this looks like C/C++ to me:

...
subst_designator = '!' counter = 1 new_arg = "!1!" *res_it="\temp\i\otrq92rq40100__db1003.xls" Meaning the last line would be the cause of the problems and would cause empiotrq92rq40100__db1003.xls to be emitted just like what you said that you saw.

Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -- Vlad P author of C++ ORM http://github.com/vladp/CppOrm/tree/master

-- http://www.fastmail.fm - A no graphics, no pop-ups email service

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