# Sub is odd with # **URL:** \ **Category:** Ruby\ **Created:** [December 30, 2007, 10:11am UTC](https://www.ruby-forum.com/t/sub-is-odd-with/124566 "2007-12-30T10:11:27Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![pavel989](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/48db29/32.png) [@pavel989](https://www.ruby-forum.com/u/pavel989)\ **Post date:** [December 30, 2007, 10:11am UTC](https://www.ruby-forum.com/t/sub-is-odd-with/124566/1 "2007-12-30T10:11:27Z")
seems to me as though I’m redundant on this forum… well anyway, doing ‘@@@@’.sub(’@’,’#’) returns ‘/#@@@’ how can I make it so that it doesn’t through in the / ? using 1.9 btw gsub doesn’t do that, but I specifically ned sub to do that. ty ---
**Author:** ![pavel989](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/48db29/32.png) [@pavel989](https://www.ruby-forum.com/u/pavel989)\ **Post date:** [December 30, 2007, 10:31am UTC](https://www.ruby-forum.com/t/sub-is-odd-with/124566/2 "2007-12-30T10:31:37Z")
Alle domenica 30 dicembre 2007, Pavel P. ha scritto: > using 1.9 btw > > gsub doesn’t do that, but I specifically ned sub to do that. > > ty First of all, I think what you see is not a ‘/’ but a ‘’. I don’t think the \ is part of the returned string. I assume you’re trying this in irb. irb displays the return value of every expression using its inspect method. String#inspect escapes some characters, such as double quotes and the # character, when it would be interpreted as the beginning of string interpolation. Since “#@” is the beginning of a string interpolation, it gets escaped. If you do a puts ‘@@@@’.sub(’@’,’#’), or examine the first element of the returned string, you’ll see that the returned string is correct. Using gsub instead of sub doesn’t display the \ because it replaces all the @ with #, and since the sequence ‘##’ isn’t a special sequence, it’s not escaped by String#inspect. I hope this helps Stefano ---
**Author:** ![pavel989](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/48db29/32.png) [@pavel989](https://www.ruby-forum.com/u/pavel989)\ **Post date:** [December 30, 2007, 11:10am UTC](https://www.ruby-forum.com/t/sub-is-odd-with/124566/3 "2007-12-30T11:10:47Z")
On Dec 30, 2007 3:11 AM, Pavel P. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > seems to me as though I’m redundant on this forum… > > well anyway, doing ‘@@@@’.sub(‘@’,‘#’) > > returns > ‘/#@@@’ It should return “#@@@” (backslash before a character inside a double quoted string is an escaped character). You are looking at the general string representation of ‘#@@@’. Do this to see what I mean … irb\> ‘@@@@’.sub(‘@’, ‘#’).each\_byte { |b| puts b } When you use 1.8 you see 4 integers, the first one the byte code for the # sign, the others for the @ sign. I think 1.9 is the same way with #each\_byte, but haven’t tried it out. > how can I make it so that it doesn’t through in the / ? irb\> puts ‘@@@@’.sub(‘@’, ‘#’) > using 1.9 btw > > gsub doesn’t do that, but I specifically ned sub to do that. ‘####’ is not special and doesn’t need to be escaped. The character sequence ‘#@’ is because it is a short hand way of “exploding” a class variable inside a String. > ## ty > > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). hth, Todd ---
**Author:** ![pavel989](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/48db29/32.png) [@pavel989](https://www.ruby-forum.com/u/pavel989)\ **Post date:** [December 30, 2007, 11:14am UTC](https://www.ruby-forum.com/t/sub-is-odd-with/124566/4 "2007-12-30T11:14:53Z")
On Dec 30, 2007 4:10 AM, Todd B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > quoted string is an escaped character). You are looking at the > > > how can I make it so that it doesn’t through in the / ? > > The character sequence ‘#@’ is because it is a short hand way of > > “exploding” a class variable inside a String. That would be “class instance variable”. My bad. Todd ---
**Author:** ![pavel989](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/48db29/32.png) [@pavel989](https://www.ruby-forum.com/u/pavel989)\ **Post date:** [December 30, 2007, 12:22pm UTC](https://www.ruby-forum.com/t/sub-is-odd-with/124566/5 "2007-12-30T12:22:04Z")
Todd B. wrote: > > The character sequence ‘#@’ is because it is a short hand way of > > “exploding” a class variable inside a String. > > That would be “class instance variable”. My bad. Well actually it would just be instance variable. ---
**Author:** ![pavel989](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/48db29/32.png) [@pavel989](https://www.ruby-forum.com/u/pavel989)\ **Post date:** [December 30, 2007, 4:42pm UTC](https://www.ruby-forum.com/t/sub-is-odd-with/124566/6 "2007-12-30T16:42:48Z")
On Dec 30, 2007 5:20 AM, Sebastian H. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Todd B. wrote: > > > > The character sequence ‘#@’ is because it is a short hand way of > > > “exploding” a class variable inside a String. > > > > That would be “class instance variable”. My bad. > > Well actually it would just be instance variable. Newbies should know that that would be the correct phrase, I admit. I don’t see, however the difference in terminology per se. I said a “class instance variable”, which would be a variable in the context of an instance of a class (class not capitalized). > Jabber: removed\_email\_address@domain.invalid > ICQ: 205544826 Todd ---
**Author:** ![pavel989](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/48db29/32.png) [@pavel989](https://www.ruby-forum.com/u/pavel989)\ **Post date:** [December 30, 2007, 4:59pm UTC](https://www.ruby-forum.com/t/sub-is-odd-with/124566/7 "2007-12-30T16:59:51Z")
Todd B. wrote: > I > don’t see, however the difference in terminology per se. I said a > “class instance variable”, which would be a variable in the context of > an instance of a class (class not capitalized). I think it gets really complicated once you start to use “class instance variable” and “Class instance variable”, both meaning different things. Especially at the beginning of a sentence where both would look the same. Given that “class instance variable” the way you use it is the same as just instance variable, I really think it’s a lot less confusing to just say the latter. ---
**Author:** ![pavel989](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/48db29/32.png) [@pavel989](https://www.ruby-forum.com/u/pavel989)\ **Post date:** [December 30, 2007, 6:18pm UTC](https://www.ruby-forum.com/t/sub-is-odd-with/124566/8 "2007-12-30T18:18:15Z")
> First of all, I think what you see is not a ‘/’ but a ‘’. > > I don’t think the \ is part of the returned string. I assume you’re > trying > this in irb. irb displays the return value of every expression using its > inspect method. String#inspect escapes some characters, such as double > quotes > and the # character, when it would be interpreted as the beginning of > string > interpolation. Since “#@” is the beginning of a string interpolation, it > gets > escaped. If you do a puts ‘@@@@’.sub(’@’,’#’), or examine the first > element > of the returned string, you’ll see that the returned string is correct. > d by String#inspect. > Stefano thanks for all the replies! but this was true, i tried it with puts and it came out normal. TY!!!