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Help in regular expression

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

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
Fahad

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
OR
contains the same thing after a space
OR
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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