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/Fish 3.1

string-replace - replace substrings

Synopsis

string replace [(-a | --all)] [(-f | --filter)] [(-i | --ignore-case)] [(-r | --regex)] [(-q | --quiet)] PATTERN REPLACEMENT [STRING...]

Description

string replace is similar to string match but replaces non-overlapping matching substrings with a replacement string and prints the result. By default, PATTERN is treated as a literal substring to be matched.

If -r or --regex is given, PATTERN is interpreted as a Perl-compatible regular expression, and REPLACEMENT can contain C-style escape sequences like \t as well as references to capturing groups by number or name as $n or ${n}.

If you specify the -f or --filter flag then each input string is printed only if a replacement was done. This is useful where you would otherwise use this idiom: a_cmd | string match pattern | string replace pattern new_pattern. You can instead just write a_cmd | string replace --filter pattern new_pattern.

Exit status: 0 if at least one replacement was performed, or 1 otherwise.

Examples

Replace Literal Examples

>_ string replace is was 'blue is my favorite'
blue was my favorite

>_ string replace 3rd last 1st 2nd 3rd
1st
2nd
last

>_ string replace -a ' ' _ 'spaces to underscores'
spaces_to_underscores

Replace Regex Examples

>_ string replace -r -a '[^\\d.]+' ' ' '0 one two 3.14 four 5x'
0 3.14 5

>_ string replace -r '(\\w+)\\s+(\\w+)' '$2 $1 $$' 'left right'
right left $

>_ string replace -r '\\s*newline\\s*' '\\n' 'put a newline here'
put a
here

© 2019 fish-shell developers
Licensed under the GNU General Public License, version 2.
https://fishshell.com/docs/3.1/cmds/string-replace.html