pattern to match certain numbers only?

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hi all, I have a xml document with multiple lines looking like:

text x="10.0"....
text x="11.5"....
text x="15.2"....
text x="20.0"...
[download]

I want to use regex but how can i match those lines where x="?" is a multiple of 10 i.e. keep first and last line only? Thanks

2006-02-20 Retitled by GrandFather, as per Monastery guidelines
Original title: 'pattern match'

Comment on pattern to match certain numbers only? Download Code

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Re: pattern to match certain numbers only? by holli (Abbot) on Feb 20, 2006 at 15:08 UTC
You can't. Do something like the following: `if ( /text x="(([0-9]+)\.([0-9]))"/ && $1 % 10 == 0 ) { #... }` [download] holli, /regexed monk/	[reply] [d/l]
Re^2: pattern to match certain numbers only? by Anonymous Monk on Feb 20, 2006 at 15:22 UTC
thanks for that - this will certainly help cheers	[reply]
Re: pattern to match certain numbers only? by tweetiepooh (Hermit) on Feb 20, 2006 at 15:45 UTC
Check for the 0 as last digit prior to decimal `if (/[1-9]0\.0/) { process the line }` [download] You'll need to expand this if you need to cope with hundreds and bigger. It also assumes there is a decimal point and a single digit after decimal.	[reply] [d/l]
Re^2: pattern to match certain numbers only? by graff (Chancellor) on Feb 21, 2006 at 06:17 UTC
This might provide a little more flexibility, and a slightly tighter matching: `if ( /=\"\d*?0\.\0+\"/ ) { # should match "0.0", "10.000", "120.0", etc... }` [download]	[reply] [d/l]
Re: pattern to match certain numbers only? by CountOrlok (Friar) on Feb 20, 2006 at 15:10 UTC
Use a module like XML::Simple to slurp the file into a hashref. Then loop through the hashref checking for the "x" value. If you don't know what the hashref will look like, use Data::Dumper to print it out so you can figure out how to loop through it. -imran	[reply]