[Maria-developers] Documentation for old regex library calls
Hi all, I'm replacing the current regular expression library with modern library(pcre) for mariadb. I need some information about the ways that code uses the old regex library. The relevant codes are in sql/item_cmpfunc.cc directory. For exapmle in the function : int Item_func_regex::regcomp(bool send_error) I can't understand most of the lines, and the code is not well-commented. In the new library(pcre) uses different way to compile a regEx so I have to understand this and code for pcre preserving the functionalists of the class. Is there any documentation for this file or the way they used to work with old regex library ? thanks. -- *Sudheera Palihakkara.* Undergraduate Department of *Computer Science and Engineering, *Faculty of Engineering, *University of Moratuwa*, Sri Lanka.
Hi, Sudheera! On Jul 21, Sudheera Palihakkara wrote:
Hi all,
I'm replacing the current regular expression library with modern library(pcre) for mariadb. I need some information about the ways that code uses the old regex library. The relevant codes are in sql/item_cmpfunc.cc directory. For exapmle in the function : int Item_func_regex::regcomp(bool send_error) I can't understand most of the lines, and the code is not well-commented. In the new library(pcre) uses different way to compile a regEx so I have to understand this and code for pcre preserving the functionalists of the class. Is there any documentation for this file or the way they used to work with old regex library ? thanks.
This class uses four functions of our old regex library - my_regcomp(), my_regerror(), my_regexec(), my_regfree(). If you remove the "my_" prefix, you can google them out, regcomp, regerror, regexec, regfree - they're all pretty standard. I presume pcre has something similar. Regards, Sergei
Hi, In file sql/item_cmpfunc.cc , Item_func_regex::regcomp function I can't understand the following block's task. (or what is being checked in side the *if*). please help *Line 5019* if (cmp_collation.collation != regex_lib_charset) { /* Convert UCS2 strings to UTF8 */ uint dummy_errors; if (conv.copy(res->ptr(), res->length(), res->charset(), regex_lib_charset, &dummy_errors)) return 1; res= &conv; } thanks On Mon, Jul 22, 2013 at 3:11 AM, Sergei Golubchik <serg@mariadb.org> wrote:
Hi, Sudheera!
On Jul 21, Sudheera Palihakkara wrote:
Hi all,
I'm replacing the current regular expression library with modern library(pcre) for mariadb. I need some information about the ways that code uses the old regex library. The relevant codes are in sql/item_cmpfunc.cc directory. For exapmle in the function : int Item_func_regex::regcomp(bool send_error) I can't understand most of the lines, and the code is not well-commented. In the new library(pcre) uses different way to compile a regEx so I have to understand this and code for pcre preserving the functionalists of the class. Is there any documentation for this file or the way they used to work with old regex library ? thanks.
This class uses four functions of our old regex library - my_regcomp(), my_regerror(), my_regexec(), my_regfree().
If you remove the "my_" prefix, you can google them out, regcomp, regerror, regexec, regfree - they're all pretty standard.
I presume pcre has something similar.
Regards, Sergei
-- *Sudheera Palihakkara.* Undergraduate Department of *Computer Science and Engineering, *Faculty of Engineering, *University of Moratuwa*, Sri Lanka.
participants (2)
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Sergei Golubchik -
Sudheera Palihakkara