Variable in a string

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

Hello, I imagine there is an easy answer to this question, but I can't seem to find it by searching the site. I had a set of files with a naming pattern like this: "CAC1Bvariant$variable_fasta.txt"

I'm trying to read all the files and iterate over the digit range, but perl keeps interpreting the $variable as extending all the way to the end of the file name. I can't figure out what character could be used to terminate the variable name. Thank you for reading this. Evan

Comment on Variable in a string

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Re: Variable in a string by chromatic (Archbishop) on Dec 09, 2011 at 18:47 UTC
Good question! Use curly braces: `my $pattern = "CAC1Bvariant${variable}_fasta.txt";`. Improve your skills with Modern Perl: the free book.	[reply] [d/l]
Re: Variable in a string by Old_Gray_Bear (Bishop) on Dec 09, 2011 at 19:15 UTC
You can build your name in stages: `my $file_name = "CAC1Bvariant"; $file_name .= $variable; $file_name .= '_fasta.txt';` [download] I think it's a little easier on the maintenance programmer's eyes, and it high-lights the fact that the varying part of the name is in the middle of the string. ---- I Go Back to Sleep, Now. OGB	[reply] [d/l]
Re^2: Variable in a string by hbm (Hermit) on Dec 09, 2011 at 20:00 UTC
Sleepy Bear, Might this be even easier on the eyes? `my $file_name = 'CAC1Bvariant' . $variable . '_fasta.txt';` [download]	[reply] [d/l]
Re^3: Variable in a string by Uberfinch (Initiate) on Dec 09, 2011 at 22:08 UTC
You guys are awesome. I've used this site for 10 years and have valued it every time I've asked a question (though haven't in 8 years, and forgot my user info!)	[reply]
Re: Variable in a string by toolic (Bishop) on Dec 09, 2011 at 18:57 UTC
See also: Scalar value constructors `perldoc perldata` [download]	[reply] [d/l]
Re: Variable in a string by leuchuk (Novice) on Dec 09, 2011 at 20:45 UTC
Could it be that you read a directory with these file names and do something with these file names? Use single quotes or `q{}` for such file names.	[reply] [d/l]