CODEWITHSUNDEEP
ruby-on-railsrubyregexarraysbackslash
Ketan Deshmukh
Ketan Deshmukh

Reputation: 668

How to define a ruby array that contains a backslash("\") character?

I want to define an array in ruby in following manner

A = ["\"]

I am stuck here for hours now. Tried several possible combinations of single and double quotes, forward and backward slashes. Alas !!

I have seen this link as well : here But couldn't understand how to resolve my problem.

Apart from this what I need to do is - 1. Read a file character by character (which I managed to do !) 2. This file contains a "\" character 3. I want to do something if my array A includes this backslash

A.includes?("\")

Any help appreciated !

Upvotes: 2

Views: 1187

Answers (3)

Naveen Agarwal
Naveen Agarwal

Reputation: 579

There are some characters which are special and need to be escaped. Like when you define a string

str = " this is test string \
and this contains multiline data \
do you understand the backslash meaning here \
it is being used to denote the continuation of line"

In a string defined in a double quotes "", if you need to have a double quote how would you doo that? "\"", this is why when you put a backslash in a string you are telling interpretor you are going to use some special characters and which are escaped by backslash. So when you read a "\" from a file it will be read as "\" this into a ruby string.

char = "\\"
char.length # => 1

I hope this helps ;)

Upvotes: 5

buruzaemon
buruzaemon

Reputation: 3907

Your issue is not with Array, your question really involves escape sequences for special characters in strings. As the \ character is special, you need to first prepend it (escape it) with a leading backslash, like so.

"\\"

You should also re-read your link and the section on escape sequences.

Upvotes: 2

Shuhei Kagawa
Shuhei Kagawa

Reputation: 4777

You can escape backslash with a backslash in double quotes like:

["\\"].include?("\\")

Upvotes: 1

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