Evolution

Evolution

Nov 2021

malloc() comments

malloc() comments

Nov 2021

Network trace in Oracle RDBMS

Network trace in Oracle RDBMS

Nov 2021

Solving Oracle passwords hashes using FPGA.

Solving Oracle passwords hashes using FPGA.

Nov 2021

_disable_txn_alert undocumented parameter in Oracle 11g

_disable_txn_alert undocumented parameter in Oracle 11g

Nov 2021

Fun with regular expressions and verification using CBMC: part IV

(Part III.) "[ \t]*[a-z]+[ \t]*=[ \t]*[0-9]+[ \t]*" This is the most practically useful example in this series of blog posts. It can be used to parse config files in form option=number, but whitespaces are also handled -- around input string and around the 'equal' sign. According to my utility, these are (random) sample input strings...

Aug 2021

Fun with regular expressions: part III

(Part II.) Like I stated before, RE often used for parsing. Here are more practical examples "var1 +var2" What it accepts? I'm going to try my utility again: string matched: [var1 var2] string matched: [var1 var2] string matched: [var1 var2] string matched: [var1 var2] string matched: [var1 var2] string matched:...

Aug 2021

Fun with regular expressions: part II

(Part I.) "(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)" In NFA, we would just create 12 paths. Alas, this is DFA, so these paths are overlapped at some vertices: "(1|2|3|4|5|6|7|8|9|10|11|12)" '1' is also accepting state, but can also lead to '10', '11' and '12': "(01|02|03|04|05|06|07|08|09|1|2|3|4|5|6|7|8|9|10|11|12)"...

Aug 2021

Fun with regular expressions: part I

Some years ago, when i struggled to understand regular expressions, I found these experiments useful. The following is like my student's notes. I hope, someone will find it useful too. TL;DR: Regular expressions usually used for finding patterns in a string/text and also simple parsing tasks. "colou?r" This is classic example in many...

Aug 2021

[Russian] В Украине - продаю BTC и ETH за наличные USD и EUR

%SUBJ. Желательно поближе к Киеву...

Jul 2021