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¶

>_ 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

>_ 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