' can be included in strings by
preceding them with a backslash character. Thus `\''
represents a string consisting of a single ' character.
Likewise, `\\' represents a string consisting of a single
\ character.
Non printable characters can be included by using a backslash to
precede the decimal (ASCII) code of the
character or the standard ASCII mnemonic for the character. Thus
`\13' and `\cr' both represent the carriage
return character. The menonics are case insensitive (`\cr' = `\Cr'
= `\CR' = `\cR').
Furthermore, the sequence `\n' represents the
end-of-line sequence, which can be a multi-character sequence, depending
on the underlying operating system.