problem in pattern match

ramsavi · 05-17-2013, 04:04 AM

Hi all,

i am using this code , but having some problem,

Code:

pattern=File_[0-9]*.csv
pattern1=File_[0-9]*_[0-9]*.csv

and then i am comparing the patterns like this

Code:

case ${arr[$i]} in
  $pattern) echo "pattern %N% match" ;;
  esac
case ${arr[$i]} in
  $pattern1) echo "pattern %N%_%N%  match" ;;
  esac

but if name of my file is File_23_23.csv
then it is returning

pattern %N% match
pattern %N%_%N% match

but the desired result should be only pattern %N%_%N% match only.

can any one please help me.

chrism01 · 05-17-2013, 05:45 AM

Try reversing the order of the tests; the first pattern is a subset of the second.

Actually, you also should use this format

Code:

# set -xv
#f=File_23_23.csv
f=File_23.csv

pattern='File_[0-9]*.csv'
pattern1='File_[0-9]*_[0-9]*.csv'

case $f in
  $pattern1) echo "pattern %N%_%N%  match" ;;
  $pattern) echo "pattern %N% match" ;;
esac

Try changing which $f value you test to see what happens or even enable the 'set -xv' cmd for debug output

You need to be careful using '*' in a regex or glob.

whizje · 05-17-2013, 05:47 AM

Case uses globbing and no regex you could try

Code:

pattern=File_*([0-9]).csv

ramsavi · 05-17-2013, 08:07 AM

i used the code
but it is not working.

chrism01 · 05-17-2013, 08:17 AM

Quote:

but it is not working.

tells us nothing.

Show your code and what happened when you ran it.
Did you even try the debug I told you about??

whizje · 05-17-2013, 08:54 AM

For this to work you have to enable extended globbing, assuming you use bash.

Code:

shopt -s extglob
pattern=File_*([0-9]).csv

ramsavi · 05-17-2013, 11:44 AM

thanks a lot its working..

konsolebox · 05-18-2013, 09:32 AM

And I suggest placing your variable around pairs of double quotes for safety.

Code:

case "${arr[$i]}" in
...