AWK: Multiple patterns per line


 
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# 1  
Old 05-04-2008
AWK: Multiple patterns per line

Hi there,

We have been given a bit of coursework using awk on html pages. Without giving too much away and risking the wrath of the plagerism checks, I can say we need to deal with certain html elements.

There may be several of these elements on one line. My question is, if there are more that one of these <tags> on a line, will awk pattern match the first one, perform the actions and then ignore the rest of the line? Or will it match the pattern, perform the action and then start where it left off, part way through the line?

If it does skip the rest of the line, how can I impliment a solution that will look at all the elements on a line?

Thank you for your help,
Plavixo
# 2  
Old 05-05-2008
We do not do homework, but perl regexp's allow multiple searches and you can use sed's
's/<regexp>/something else/g' for global replacement. In awk you probably want a loop
Code:
while (match($0, <regexp>) )
{
   $0="somechange"  "old part of of $0 that you did not change "
}

 
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