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Matching regular expressions

aiikahn
Novice

Mar 10, 2008, 9:57 AM

Post #1 of 4 (458 views)

Matching regular expressions	Can't Post

I'm trying find out a way to print out the string for a given matching pattern but it keeps giving me the whole line. I'm not sure what I'm doing wrong...

Code

   
 
$_ = /[g]\w]/i;

I'd appreciate any assistance. Thank you. Still new with perl...

KevinR
Veteran

Mar 10, 2008, 11:13 AM

Post #2 of 4 (456 views)

Re: [aiikahn] Matching regular expressions [In reply to]	Can't Post

Please post your perl code and show what the data you are searching is and what you are looking for and what you want to display.
-------------------------------------------------

aiikahn
Novice

Mar 10, 2008, 11:46 AM

Post #3 of 4 (455 views)

Re: [KevinR] Matching regular expressions [In reply to]	Can't Post

Code

open (IN, "textfile.txt"); #textfile content "hello world\n this is a test"  
 
while (defined($test = <IN>) {  
$test = m/[e]/i;  
print $test;  
}  
 
close (IN);

Output should be:
hello
test

Instead, it gives me the whole content again. Thank you!

eWish
User

Mar 10, 2008, 4:48 PM

Post #4 of 4 (447 views)

Re: [aiikahn] Matching regular expressions [In reply to]	Can't Post

The output you are getting is what you should be getting with the code you are using. You are checking to see the letter 'e' exists in the line not in each of the words in the line. $test holds the entire line.

If you want to split it into each of the words you can do something like this.

Code

open (my $FILE, '<', $file_to_open) || die "Can't open file: $!\n"; 
while (my $line = <$FILE>) { 
	for (grep /place pattern here/, split(/ /, $line)) { 
		print $_, "\n"; 
	} 
} 
close ($FILE);

(This post was edited by eWish on Mar 10, 2008, 6:25 PM)

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