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REGULAR EXPRESSIONS - easy for a master

REGULAR EXPRESSIONS - easy for a master

REGULAR EXPRESSIONS - easy for a master

(OP)
I need to get the two numbers from this line immediatley followed by ns (ie the 5.678 & 7.908)

DAMN "I_DONT_KNOW_PERL" WELL = 23 nS AS ¦ 5.678ns   ¦   7.908ns    ¦     7

Cheers

(sorry if this is a bit simplistic - I've only been doing perl for 3 days)

Gordon Bell
gordon.bell@xilinx.com

RE: REGULAR EXPRESSIONS - easy for a master

#!/usr/local/bin/perl
$string = 'stuff ¦ 12.34ns ¦ 34.56ns';

# explain match - \d* - matches zero or more digits
#               - \.{0,1} - matches zero or one dot
#               - \d* - matches zero or more digits
#               - ns - obviously matches 'ns'
#               - the 'g' - match as many times as possible
while ($string =~ /\d*\.{0,1}\d*ns/g)
    {
    print "$&\n";
    }
# $& catches matched patterns

RE: REGULAR EXPRESSIONS - easy for a master

Take a look at the split function.  Say your string is in the variable $My_String...

@Items = split("¦", $My_String);

@Items is an array that will now hold each field from $My_String as a seperate array item.  The "¦" in the split command says to use the ¦ character as a field delimiter.

Remembering that arrays in perl are indexed from 0, you can now refer to the "ns" fields as $Items[1] and $Items[2].

Hope this helps.

RE: REGULAR EXPRESSIONS - easy for a master

(OP)
How do I make the string $My_String - it is in a complete file of data of various sorts.

Gordon Bell
gordon.bell@xilinx.com

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