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| Thread | Thread Starter | Forum | Replies | Last Post |
| Regular Expression question | Katkota | UNIX for Dummies Questions & Answers | 6 | 05-14-2008 12:23 PM |
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05-14-2008
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Question on Regular Expression
Folks;
Could some one tell me what these 2 regular expressions mean: [^\n\r]*/([^/\n\r]*)/[^/\n\r]* (\d\d\d\d/\d\d/\d\d/[-_\.\w\d]*?) 
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05-14-2008
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[^\n\r]*/([^/\n\r]*)/[^/\n\r]*
Match 0 or more characters except carriage returns or line feeds, Followed by a single / character, Next match 0 or more characters except / characters, carriage returns or line feeds again, group this for later retrieval, Match another single / Finally, another match of 0 or more chars except / returns and feeds as before. In english: extract the second to last string seperated by / from a line. (\d\d\d\d/\d\d/\d\d/[-_\.\w\d]*?) Match an 8 digit number, followed by anything consiting of - _ . letters or numbers, finally followed by a ?
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05-14-2008
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Thanks Smiling Dragon;
Now i have this question If i have a list of directories, for example: /fs/pas/2007/4/6/2634210/admdat/examin /fs/pas/2007/4/6/2634210/admdat2/stat /fs/pas/2007/4/6/2634210/admdat3/data /fs/pas/2007/4/6/2634210/im_2/0b.dcm Now; my questions are: 1. How to use RE to extract the last file such as "examin and stat,..."? 2. How to use RE to extract the parent directory for the last file. such as "amdat, amdat2, im_2,..."? 3. How to use RE to extract the date in the middle "2007/4/6"?
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05-16-2008
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Code:
perl -nle'm|([^/]*)$| and print $1' input
perl -nle'm|([^/]*)/[^/]*$| and print $1' input
perl -nle'm|/([^/]*/){2}(([^/]*/){2}[^/]*)| and print $2' input
Code:
perl -F\/ -anle'print $F[-1]' input perl -F\/ -anle'print $F[-2]' input perl -F\/ -anle'print join "/", @F[3..5]' input
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