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Free Book downloads for “Textbook Of Optics” by N Subramanyam Bibliography, Bookmark [FREE] – Duou.com

Duou.com. Struik.

Free Book downloads for “Textbook Of Optics” by N Subramanyam Bibliography, Bookmark [FREE] – Duou.com

Duou.com. Struik.

Free Book downloads for “Textbook Of Optics” by N Subramanyam Bibliography, Bookmark [FREE] – Duou.com

Duou.com. Struik.

Free Book downloads for “Textbook Of Optics” by N Subramanyam Bibliography, Bookmark [FREE] – Duou.com

Duou.com. Struik.

Free Book downloads for “Textbook Of Optics” by N Subramanyam Bibliography, Bookmark [FREE] – Duou.com

Duou.com. Struik.

Free Book downloads for “Textbook Of Optics” by N Subramanyam Bibliography, Bookmark [FREE] – Duou.com

Duou.com. Struik.

Free Book downloads for “Textbook Of Optics” by N Subramanyam Bibliography, Bookmark [FREE] – Duou.com

Duou.com. Struik.

Free Book downloads for “Textbook Of Optics” by N Subramanyam Bibliography, Bookmark [FREE] – Duou.com

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Free Book downloads for “Textbook Of Optics” by N Subramanyam Bibliography

44.08.2010 – Homework help for the e-book optics by brijlal and subramanyam pdf free pdf free online tutorial that features a vibrant community of students, professors and learning aids.Q:

Handling Errno::ENOENT in gsub

Ruby 1.9.2, Rails 3.1
When I try and use a gsub as below, I run into issues with Errno::ENOENT
username = params[:username]
new_username = gsub(username, :u_m)

I’ve tried a few different ways to get gsub to not return my ENOENT errors but I’m having trouble grasping how to actually handle this in a clean way. The goal is to only replace text that matches the username and to continue on as expected if no matches are found.
My first though was to use guard, but that still runs into the ENOENT errors which I don’t want, I just want my gsub to not error when no matches are found, and it will error when the username actually is u_m.
guard username =~ /u_m/ do
username = gsub(username, :u_m)
end

EDIT: Hmm – looks like my problem is gsub itself. It will raise an ENOENT error if I pass it any string I can’t find in the file.
Is there a way around this (other than using an external regex solution)?

A:

Try this
new_username = gsub(username, :u_m) do |match|
# do what you need with match here
if match
# if match
# do what you need here
else
# do nothing
end
end

EDIT
Replace below code
gsub(username, :u_m) do |match|
# do what you need with match here
if match
# if match
# do what you need here
else
# do nothing
end
end

with this
gsub(username, :u_m) do |match|
# do what you need with match here
f988f36e3a

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