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docs: Update where function operators

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Related to #11281
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Joe Mooring 2023-07-29 05:45:30 -07:00 committed by Bjørn Erik Pedersen
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docs/content/en/functions/where.md
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@ -73,6 +73,9 @@ The following logical operators are available with `where`:
`intersect` `intersect`
: `true` if a given field value that is a slice/array of strings or integers contains elements in common with the matching value; it follows the same rules as the [`intersect` function][intersect]. : `true` if a given field value that is a slice/array of strings or integers contains elements in common with the matching value; it follows the same rules as the [`intersect` function][intersect].
`like`
: `true` if a given field value matches a regular expression. Use the `like` operator to compare `string` values. Returns `false` when comparing other data types to the regular expression.
## Use `where` with boolean values ## Use `where` with boolean values
When using booleans you should not put quotation marks. When using booleans you should not put quotation marks.
```go-html-template ```go-html-template
@ -81,7 +84,6 @@ When using booleans you should not put quotation marks.
{{ end }} {{ end }}
``` ```
## Use `where` with `intersect` ## Use `where` with `intersect`
```go-html-template ```go-html-template
@ -102,6 +104,32 @@ You can also put the returned value of the `where` clauses into a variable:
{{ end }} {{ end }}
{{< /code >}} {{< /code >}}
## Use `where` with `like`
This example matches pages where the "foo" parameter begins with "ab":
```go-html-template
{{ range where site.RegularPages "Params.foo" "like" "^ab" }}
<h2><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></h2>
{{ end }}
```
When specifying the regular expression, use a raw [string literal] (backticks) instead of an interpreted string literal (double quotes) to simplify the syntax. With an interpreted string literal you must escape backslashes.
[string literal]: https://go.dev/ref/spec#String_literals
This function uses the [RE2] regular expression library. See the [RE2 syntax documentation] for details. Note that the RE2 `\C` escape sequence is not supported.
[RE2]: https://github.com/google/re2/
[RE2 syntax documentation]: https://github.com/google/re2/wiki/Syntax/
{{% note %}}
The RE2 syntax is a subset of that accepted by [PCRE], roughly speaking, and with various [caveats].
[caveats]: https://swtch.com/~rsc/regexp/regexp3.html#caveats
[PCRE]: https://www.pcre.org/
{{% /note %}}
## Use `where` with `first` ## Use `where` with `first`
Using `first` and `where` together can be very Using `first` and `where` together can be very