How do you embed double-quotes an Elixir string?

Question

I have a sting that has embedded ":

tx <iq id="wUcdTMYuYoo41" to="2348138248411@" type="set" xmlns="w:profile:picture">

how can i present such a string as a value in Elixir?

for example:

iex> s= "tx <iq id="wUcdTMYuYoo41" to="2348138248411@" type="set" xmlns="w:profile:picture">"

Using ~s and ~S did not help

iex(20)> s=~S("tx <iq id="wUcdTMYuYoo41" to="2348138248411@" type="set" xmlns="w:profile:picture">")              
** (SyntaxError) iex:20: keyword argument must be followed by space after: w:

iex(20)> s=~s("tx <iq id="wUcdTMYuYoo41" to="2348138248411@" type="set" xmlns="w:profile:picture">")
** (SyntaxError) iex:20: keyword argument must be followed by space after: w:

iex(20)>

Gazler · Accepted Answer · 2015-10-17T09:54:23.577

24

You can escape the double quotes:

s ="tx <iq id=\"wUcdTMYuYoo41\" to=\"2348138248411@\" type=\"set\" xmlns=\"w:profile:picture\">"

There is a sigil_s to make this more convenient (there is also sigil_S which doesn't interpolate variables):

s = ~s(tx <iq id="wUcdTMYuYoo41" to="2348138248411@" type="set" xmlns="w:profile:picture">)

Quotes are also escaped when using multi-line strings (heredocs):

"""
tx <iq id="wUcdTMYuYoo41" to="2348138248411@" type="set" xmlns="w:profile:picture">
"""

edited Oct 17 '15 at 09:54

answered Oct 17 '15 at 09:44

Gazler

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245

Thanks. When we pull such strings from a File.stream!("path/to/file") do we need to do same? on each line returned? – Charles Okwuagwu Oct 17 '15 at 09:45
1

Using `File.Stream` will automatically escape the quotes. e.g. `iex(4)> IO.gets ">"; >""" "TEST "" "; "\"\"\" \"TEST \"\" \"\n"` – Gazler Oct 17 '15 at 09:48
Please ~s and ~S did not work see errors reported in edited question above – Charles Okwuagwu Oct 17 '15 at 09:53
1

You need a space before the `~` - `s = ~s(...)` not `s=~s(...)` – Gazler Oct 17 '15 at 09:55

score 5 · Answer 2 · answered Dec 04 '15 at 03:57

The ~s or ~S sigils are the way to go, you just need a space after your equals sign:

iex(1)> s = ~s("tx <iq id="wUcdTMYuYoo41" to="2348138248411@" type="set" xmlns="w:profile:picture">")
"\"tx <iq id=\"wUcdTMYuYoo41\" to=\"2348138248411@\" type=\"set\" xmlns=\"w:profile:picture\">\""

iex(2)> s = ~S("tx <iq id="wUcdTMYuYoo41" to="2348138248411@" type="set" xmlns="w:profile:picture">")
"\"tx <iq id=\"wUcdTMYuYoo41\" to=\"2348138248411@\" type=\"set\" xmlns=\"w:profile:picture\">\""

How do you embed double-quotes an Elixir string?

2 Answers2

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