📊 Field filters¶
| Filter | Description |
|---|---|
&N:S |
Split value using separator S, output N-th field.Field indices N start from 1.Use -N for backward indexing.Any other character than : can be also used as a delimiter.Use of / as a delimiter has special meaning (see below). |
&N/S |
Split value using regular expression S, output N-th field. |
&N |
Split value using default separator, output N-th field. |
The default field separator is horizontal tab.
- Use
-s, --separatoroption to change it to a string. - Use
-S, --separator-regexoption to change it to a regular expression.
echo a1-b2 | rew '{&1} {&2}' -s'-' # Will print "a1 b2"
echo a1-b2 | rew '{&1} {&2}' -S'[^a-z]+' # Will print "a b"
Examples:
| Input | Pattern | Output | Input | Pattern | Output |
|---|---|---|---|---|---|
a1\tb2 |
{&1} |
a1 |
a1\tb2 |
{&-1} |
b2 |
a1\tb2 |
{&2} |
b2 |
a1\tb2 |
{&-2} |
a1 |
a1--b2 |
{&1:-} |
a1 |
a1--b2 |
{&-1:-} |
b2 |
a1--b2 |
{&2:-} |
(empty) | a1--b2 |
{&-2:-} |
(empty) |
a1--b2 |
{&3:-} |
b2 |
a1--b2 |
{&-3:-} |
a1 |
a1--b2 |
{&1/[^a-z]+} |
a |
a1--b2 |
{&-1/[^a-z]+} |
(empty) |
a1--b2 |
{&2/[^a-z]+} |
b |
a1--b2 |
{&-2/[^a-z]+} |
b |
a1--b2 |
{&3/[^a-z]+} |
(empty) | a1--b2 |
{&-3/[^a-z]+} |
a |