Tag Archives: REGEX

Regex to identify word in second position on a line

April 21, 2013 Bartle Doo Leave a comment

I am interested in finding a regex to find a word in second position on a line. The word in question is या
I tried the following PERL EXPRESSION but it did not work:

Code:

[^[:word:]] या 

or

^W या

But both gave Null results
I am giving below a Sample file:

Code:

देना या सौंपना=delegate

तह जमना या जमाना=film

झुकना या झुकाना=slant

घुलना या घोलना=dissolve

घिसना या घिसाना=grate

खुले आम या प्रकट=avow

एड़ लगाना या देना=spur

उभरना या उभारना=heave

उचकाना या झाड़ना=shrug

आना या कुछ करना=mistime

हो जाना या होना=orient

होना या हो जाना=double

लिखना या लगाना=preface

बल या शिकन पड़ना=cockle

I would like the REGEX to single out all lines where the word या occurs in second position.
Many thanks for the help.

From: http://www.unix.com/shell-programming-scripting/221723-regex-identify-word-second-position-line.html

Linux

Need a REGEX to increment the file number of a pdf file

March 28, 2013 Bartle Doo Leave a comment

By Marcus Aurelius

Hello,

I have a few thousand .pdf files in various folders each have a naming scheme like this:

006_-_Titled_Document_#34_-_September-25-2011-side-1.pdf

In each folder, the number system starts at 001 (as you see on the far left of the file name), and then ends at 999 (maximum .pdf files).

Somewhere in the collection of files say .pdf # 286, I have 286 twice (duplicate). Which screws up my numbering system.

I need a REGEX that I can enter into the shell when I’m in the .pdf directory, and start from say the duplicate # 286 and increment that 2nd duplicate # 286 & all the numbers after that by +1. So that they are all renamed appropriately.

This way I don’t have to go in there and rename each .pdf file manually one by one.

Unfortunately, I am not very good with REGEX and haven’t had much need for it in the past until now.

Would anyone know the best way to automate this .pdf renumbering task? I would appreciate any constructive thoughts on how to accomplish this.

Thank you.

Linux

Bash Vs. Bourne REGEX: metacharacters escaping

March 20, 2013 Bartle Doo Leave a comment

By ConcealedKnight

I am currently reading a very old reference from O’Reilly: Sed and Awk 2nd Edition reprinted in 2000. So far, it’s a solid read and still very relevant. I’d highly recommend this to anyone.

The only problem I have with this book is that I had to resort to bourne shell to get my examples to work since bash wasn’t ubiquitous when the book was written.

So, when I was trying to follow the book example, I get the error in bash on my latest Ubuntu Server distro.

I tried to use a regular expression that looked for any line containing the string, “book” in the bookworks file. It is not my ultimate goal to correctly extract all lines with the string “book” yet as I was following the book examples, which will show me the correct form.

I tried the following command in bash:

Code:

grep " ["[{(]*book[]})"?!.,;:'s]* " bookwords

I get the following error in bash:

Code:

-bash: !.,: event not found

But when I tried the command after switching over to bourne shell, I get no error, and it gave me the output I expected like the one in the book examples. Can someone please tell me why is this happening? I’d like to know what metacharacters are causing this and how I can escape it in Bash? I wish there is a third edition of this book that covers REGEX in bash.

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Tag Archives: REGEX

Regex to identify word in second position on a line

Need a REGEX to increment the file number of a pdf file

Bash Vs. Bourne REGEX: metacharacters escaping

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