Re: [Boost-users] Any function in boost::regex to escape everything ofa text

From: John Maddock (john_at_[hidden])
Date: 2007-03-13 14:32:50

llwaeva_at_[hidden] wrote:
> hi there,
>  I am working with a pattern-replace job with boost:regex. For
> convenience, I use  replace_all_regex to do that. Here is my code
>
> replace_all_regex( TEXT_TO_BE_REPLACED, regex_exp, format_string,
> format_all );
>
> TEXT_TO_BE_REPLACED is a text containing some patterns like %a, %b
> and %c which will be repalced with a specific string(format_string)
> that is inputed by user.  However, the input string (format_string)
> may have some characters related to the regular expression, such
> characters  must be escaped before the substitution.  The following
> code is for that purpose
>
>    replace_all( input, "$", "$$" );
>    replace_all( input, "\\", "\\\\" );
>    replace_all( input, ":", "\\:" );
>    replace_all( input, "?", "\\?" );
>    replace_all( input, "(", "\\(" );
>    replace_all( input, ")", "\\)" );
>
> The substitution works fine sometimes and fails when the input string
> (format_string) contains character which is not escaped. I just
> wonder if there is any function defined in boost::regex to escape all
> SPECIAL characters.

Use "format_literal" rather than "format_all" and all the characters in the 
format string will be output "as is", and none will be treated as special 
characters.

John.