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For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

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Help in regular expression

Posted by shafa.fahad (FahaD), 7 November 2006

I am relatively new to perl and hence the regular expressions as well....

Please help me understanding this re syntax, To be precise i need
to know what and all pattern the below expression matches to

if ($string =~ /^(ORA-[0-9]+):.*/ || $string =~ /.*[ ]+(ORA-[0-9]+):.*/ || $string =~ /^(Corrupt block)/)

Thanks in advance

Posted by admin (Graham Ellis), 7 November 2006
Ah - I think you need our regular expression course  

Your example looks for a string which ...

starts with ORA, followed by some digits and a colon
contains the same thing after a space
starts with "Corrupt block".

If you need a full explanation of how, where, why, etc ... then I don't think that the forum's a very good place for me to tell you - I would be re-writing a whole book.   There are complete books on regular expressions (see our library) or, as I said earlier, we do a one day course.

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