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Traditional Unix regular expression syntax follow common conventions but often differed from tool to tool.

 

The IEEE POSIX Basic Regular Expressions (BRE) standard (ISO/IEC 9945-2:1993 Information technology -- Portable Operating System Interface (POSIX) -- Part 2: Shell and Utilities, successively revised as ISO/IEC 9945-2:2002 Information technology -- Portable Operating System Interface (POSIX) -- Part 2: System Interfaces, ISO/IEC 9945-2:2003, and currently ISO/IEC/IEEE 9945:2009 Information technology -- Portable Operating System Interface (POSIX®) Base Specifications, Issue 7) was designed mostly for backward compatibility with the traditional (Simple Regular Expression) syntax but provided a common standard which has since been adopted as the default syntax of many Unix and Windows regular expression tools, though there is often some variation or additional features.

 

In my dealing with uBot, I have not found any difference yet. This tool has been dead on for me.

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