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* Remove extra backtick * Reword explanation of update * Reword explanation of relative update * Change "remaple" to "remain" * Change "clovver" to "clobber" * Reword explanation of update for comment operators * Reword explanation of relative update for comment operators * Change "array" to "expression" * Change "the golangs" to "Golang's" * Change "golangs" to "Golang's" * Change "can durations" to "can add durations" * Change "array scalars" to "arrays" * Change "beit" to "be it" * Fix typo in `eval` tip * Fix typo in header for `has` operation * Add space before pipe in `line` operator example * Fix typos in explanation of deep array merges * Change "is now used" to "is now used." * Change "object," to "object." * Changes "indexes" to "indices" * Remove extraneous copied text from `..` article * Reword explanation of `...` operator * Change "your are" to "you are" * Add link to `string` operator docs in `select` article * Change "is a" to "parameter specifies" in `string` operators article * Change "new line" to "newline" * Change "golang regex" to "Golang's regex" * Change "golang" to "Golang" * Add period * Remove comma in `subtract` article * Remove duplicate number subtraction example * Remove comma in `traverse` operator article * Clarify use of brackets when `read`ing with special characters
2.2 KiB
2.2 KiB
Select
Select is used to filter arrays and maps by a boolean expression.
Related Operators
- equals / not equals (
==,!=) operators here - comparison (
>=,<etc) operators here - boolean operators (
and,or,anyetc) here
Select elements from array using wildcard prefix
Given a sample.yml file of:
- cat
- goat
- dog
then
yq '.[] | select(. == "*at")' sample.yml
will output
cat
goat
Select elements from array using wildcard suffix
Given a sample.yml file of:
- go-kart
- goat
- dog
then
yq '.[] | select(. == "go*")' sample.yml
will output
go-kart
goat
Select elements from array using wildcard prefix and suffix
Given a sample.yml file of:
- ago
- go
- meow
- going
then
yq '.[] | select(. == "*go*")' sample.yml
will output
ago
go
going
Select elements from array with regular expression
See more regular expression examples under the string operator docs.
Given a sample.yml file of:
- this_0
- not_this
- nor_0_this
- thisTo_4
then
yq '.[] | select(test("[a-zA-Z]+_[0-9]$"))' sample.yml
will output
this_0
thisTo_4
Select items from a map
Given a sample.yml file of:
things: cat
bob: goat
horse: dog
then
yq '.[] | select(. == "cat" or test("og$"))' sample.yml
will output
cat
dog
Use select and with_entries to filter map keys
Given a sample.yml file of:
name: bob
legs: 2
game: poker
then
yq 'with_entries(select(.key | test("ame$")))' sample.yml
will output
name: bob
game: poker
Select multiple items in a map and update
Note the brackets around the entire LHS.
Given a sample.yml file of:
a:
things: cat
bob: goat
horse: dog
then
yq '(.a.[] | select(. == "cat" or . == "goat")) |= "rabbit"' sample.yml
will output
a:
things: rabbit
bob: rabbit
horse: dog