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# 1  
Old 08-26-2009
regex to match basename

Hi

Can somebody please help me know how do i match the basename using a regular expression using posix standard in shell script

suppose i want to match

/u01/Sybase/data/master.dbf the result should be master.dbf as i want to match everything after the last /

regards
# 2  
Old 08-26-2009
Code:
 echo /u01/Sybase/data/master.dbf | grep -o '[^/]*$'

# 3  
Old 08-26-2009
If u make a little search, you could have found the answer yourself...
Code:
 
>str="/u01/Sybase/data/master.dbf "
>echo ${str##*/}
>master.dbf

# 4  
Old 08-26-2009
>str="/u01/Sybase/data/master.dbf"
>echo $str
/u01/Sybase/data/master.dbf
>basename $str
master.dbf
# 5  
Old 08-27-2009
Hi

Thanks to all responded and the responses are also excellent at this point of time i am very keen on the regex solution

Code:
 echo /u01/Sybase/data/master.dbf | grep -o '[^/]*$'

due to my inquisitiveness in regex what does this regex do

Code:
grep -o '[^/]*$'

I know individually
^ matches begining of the line
$ matches end of the line
* matches anything
/ is a escape sequence

i dont understand what a [] does and what does the combined expression all put together mean including the greps -o switch
# 6  
Old 08-27-2009
Quote:
Originally Posted by xiamin
Hi

Thanks to all responded and the responses are also excellent at this point of time i am very keen on the regex solution

Code:
 echo /u01/Sybase/data/master.dbf | grep -o '[^/]*$'

due to my inquisitiveness in regex what does this regex do

Code:
grep -o '[^/]*$'

I know individually
^ matches begining of the line
$ matches end of the line
* matches anything
/ is a escape sequence

i dont understand what a [] does and what does the combined expression all put together mean including the greps -o switch
I'll try to explain it:

Code:
[^/]*$

[] is called a bracket expression (see man grep).

^ as first character within the bracket expression means: don't match characters within the brackets

[^/] means select all characters except a slash

*$
means match the characters untill the last character

Thus the whole regex means: select all the characters till the end without a slash.


Regards
# 7  
Old 08-27-2009
Hi Franklin

Thank you for the excellent explanation.

However what does the -o do it doesnt sem to work on AIX

when i do

Code:
echo /u01/Sybase/data/master.dbf | grep '[^/]'

shoudlnt it return everything minus the / slash in my case it returns

Code:
u01 Sybase data master.dbf




regards

Last edited by xiamin; 08-27-2009 at 05:51 AM..

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