> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/t/text_between.md).

# Text between

Uses /^/ and /$/ as start and end delimiters. Additionally, the start and end delimiters can be regular expressions.

```ruby
func text_between (text, beg, end) {

    beg.escape! if beg.kind_of(String)
    end.escape! if end.kind_of(String)

    Regex("#{beg}(.*?)(?:#{end}|\\z)", 's').match(text)[0] \\ ""
}

var tests = [
    Hash(
        text  => "Hello Rosetta Code world",
        start => "Hello ",
        end   => " world",
        out   => "Rosetta Code",
    ),
    Hash(
        text  => "Hello Rosetta Code world",
        start => /^/,
        end   => " world",
        out   => "Hello Rosetta Code",
    ),
    Hash(
        text  => "Hello Rosetta Code world",
        start => "Hello ",
        end   => /$/,
        out   => "Rosetta Code world",
    ),
    Hash(
        text  => "</div><div style=\"chinese\">你好嗎</div>",
        start => "<div style=\"chinese\">",
        end   => "</div>",
        out   => "你好嗎",
    ),
    Hash(
        text  => "<text>Hello <span>Rosetta Code</span> world</text><table style=\"myTable\">",
        start => "<text>",
        end   => "<table>",
        out   => "Hello <span>Rosetta Code</span> world</text><table style=\"myTable\">",
    ),
    Hash(
        text  => "<table style=\"myTable\"><tr><td>hello world</td></tr></table>",
        start => "<table>",
        end   => "</table>",
        out   => "",
    ),
    Hash(
        text  => "The quick brown fox jumps over the lazy other fox",
        start => "quick ",
        end   => " fox",
        out   => "brown",
    ),
    Hash(
        text  => "One fish two fish red fish blue fish",
        start => "fish ",
        end   => " red",
        out   => "two fish",
    ),
    Hash(
        text  => "FooBarBazFooBuxQuux",
        start => "Foo",
        end   => "Foo",
        out   => "BarBaz",
    ),
]

tests.each { |t|
    var r = text_between(t{:text}, t{:start}, t{:end})
    assert_eq(t{:out}, r)
    say "text_between(#{t{:text}.dump}, #{t{:start}.dump}, #{t{:end}.dump}) = #{r.dump}"
}
```

## Output:

```
text_between("Hello Rosetta Code world", "Hello ", " world") = "Rosetta Code"
text_between("Hello Rosetta Code world", /^/, " world") = "Hello Rosetta Code"
text_between("Hello Rosetta Code world", "Hello ", /$/) = "Rosetta Code world"
text_between("</div><div style=\"chinese\">\x{4F60}\x{597D}\x{55CE}</div>", "<div style=\"chinese\">", "</div>") = "\x{4F60}\x{597D}\x{55CE}"
text_between("<text>Hello <span>Rosetta Code</span> world</text><table style=\"myTable\">", "<text>", "<table>") = "Hello <span>Rosetta Code</span> world</text><table style=\"myTable\">"
text_between("<table style=\"myTable\"><tr><td>hello world</td></tr></table>", "<table>", "</table>") = ""
text_between("The quick brown fox jumps over the lazy other fox", "quick ", " fox") = "brown"
text_between("One fish two fish red fish blue fish", "fish ", " red") = "two fish"
text_between("FooBarBazFooBuxQuux", "Foo", "Foo") = "BarBaz"
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://trizen.gitbook.io/sidef-lang/programming_tasks/t/text_between.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.