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Perl Tutorial Book

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2.1.3.1 Interpolation in Double-quoted Strings

Interpolation is a special process whereby certain special strings written in ASCII are replaced by something different. In Single-quoted Strings, we noted that certain sequences in single-quoted strings (namely, \\ and \') were treated differently. This is very similar to what happens with interpolation. For example, in interpolated double-quoted strings, various sequences preceded by a `\' character act different.

Here is a chart of the most common of these:

String

Interpolated As

`\\'

an actual, single backslash character

`\$'

a single $ character

`\@'

a single @ character

`\t'

tab

`\n'

newline

`\r'

hard return

`\f'

form feed

`\b'

backspace

`\a'

alarm (bell)

`\e'

escape

`\033'

character represented by octal value, 033

`\x1b'

character represented by hexadecimal value, 1b

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