time-to-botec

README.md (5836B)

---

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 # substringBefore
 
 > Return the part of a string before a specified substring.
 
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 ## Usage
 
 ```javascript
 var substringBefore = require( '@stdlib/string/substring-before' );
 ```
 
 #### substringBefore( str, search )
 
 Returns the part of a string before a specified substring.
 
 ```javascript
 var str = 'beep boop';
 var out = substringBefore( str, ' ' );
 // returns 'beep'
 
 out = substringBefore( str, 'o' );
 // returns 'beep b'
 ```
 
 </section>
 
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 ## Notes
 
 -   If a substring is not present in a provided string, the function returns the input string.
 -   If provided an empty substring, the function returns an empty string.
 
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 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var substringBefore = require( '@stdlib/string/substring-before' );
 
 var out = substringBefore( 'beep boop', 'p' );
 // returns 'bee'
 
 out = substringBefore( 'Hello World!', 'xyz' );
 // returns 'Hello World!'
 
 out = substringBefore( 'Hello World!', '' );
 // returns ''
 
 out = substringBefore( '', 'xyz' );
 // returns ''
 ```
 
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 ## CLI
 
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 ### Usage
 
 ```text
 Usage: substring-before [options] --search=<string> [<string>]
 
 Options:
 
   -h,    --help                Print this message.
   -V,    --version             Print the package version.
          --search string       Search string.
          --split sep           Delimiter for stdin data. Default: '/\\r?\\n/'.
 ```
 
 </section>
 
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 ### Notes
 
 -   If the split separator is a [regular expression][mdn-regexp], ensure that the `split` option is either properly escaped or enclosed in quotes.
 
     ```bash
     # Not escaped...
     $ echo -n $'foo\nbar\nbaz' | substring-before --search a --split /\r?\n/
 
     # Escaped...
     $ echo -n $'foo\nbar\nbaz' | substring-before --search a --split /\\r?\\n/
     ```
 
 -   The implementation ignores trailing delimiters.
 
 </section>
 
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 ### Examples
 
 ```bash
 $ substring-before abcdefg --search d
 abc
 ```
 
 To use as a [standard stream][standard-streams],
 
 ```bash
 $ echo -n $'beep\nboop' | substring-before --search p
 bee
 boo
 ```
 
 By default, when used as a [standard stream][standard-streams], the implementation assumes newline-delimited data. To specify an alternative delimiter, set the `split` option.
 
 ```bash
 $ echo -n 'beep\tboop' | substring-before --search p --split '\t'
 bee
 boo
 ```
 
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 * * *
 
 ## See Also
 
 -   <span class="package-name">[`@stdlib/string/substring-before-last`][@stdlib/string/substring-before-last]</span><span class="delimiter">: </span><span class="description">return the part of a string before the last occurrence of a specified substring.</span>
 -   <span class="package-name">[`@stdlib/string/substring-after`][@stdlib/string/substring-after]</span><span class="delimiter">: </span><span class="description">return the part of a string after a specified substring.</span>
 -   <span class="package-name">[`@stdlib/string/substring-after-last`][@stdlib/string/substring-after-last]</span><span class="delimiter">: </span><span class="description">return the part of a string after the last occurrence of a specified substring.</span>
 
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 [standard-streams]: https://en.wikipedia.org/wiki/Standard_streams
 
 [mdn-regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
 
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 [@stdlib/string/substring-before-last]: https://github.com/stdlib-js/string/tree/main/substring-before-last
 
 [@stdlib/string/substring-after]: https://github.com/stdlib-js/string/tree/main/substring-after
 
 [@stdlib/string/substring-after-last]: https://github.com/stdlib-js/string/tree/main/substring-after-last
 
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