How do you embed double-quotes an Elixir string?

问题:

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)> 

回答1:

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">
"""

回答2:

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\">\""