问题
why ruby is prepends '\' character while I am trying to run below code. It is happening with only '#$'
It is happening with all ruby version.
puts '#$' => '\#$'
or
'#$' => '\#$'
or
'mypassord#$123' => 'mypassord\#$123'
Please share you experience here. Is it a ruby problem or anything?
回答1:
No it is not a ruby problem. It is your problem. Since #$foo can be interpreted as interpolation of the global variable $foo, it is necessary to escape the # character. That is why there is a backslash.
To be more precise, there is no possibility of interpolation with the string "#$" ($ is an invalid global variable) or "#$123" ($123 is an invalid global variable), but it makes the inspection algorithm or the interpolation algorithm complicated to check the sequence after #$, so I guess that is why # is escaped even in such cases.
来源：https://stackoverflow.com/questions/24825136/ruby-string-prepend-character