245 lines
6.2 KiB
Markdown
245 lines
6.2 KiB
Markdown
<!--
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@license Apache-2.0
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Copyright (c) 2021 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# substringAfterLast
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> Return the part of a string after the last occurrence of a specified substring.
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<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
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<section class="intro">
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</section>
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<!-- /.intro -->
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<!-- Package usage documentation. -->
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<section class="usage">
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## Usage
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```javascript
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var substringAfterLast = require( '@stdlib/string/substring-after-last' );
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```
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#### substringAfterLast( str, search\[, fromIndex] )
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Returns the part of a string after the last occurrence of a specified substring.
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```javascript
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var str = 'beep boop';
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var out = substringAfterLast( str, 'b' );
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// returns 'oop'
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out = substringAfterLast( str, 'o' );
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// returns 'p'
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```
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By default, the search starts at the end of the string and proceeds backwards to the beginning. To start the search at a specified index, specify an integer for the `fromIndex` argument.
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```javascript
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var str = 'beep boop';
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var out = substringAfterLast( str, 'b', 3 );
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// returns 'eep boop'
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```
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</section>
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<!-- /.usage -->
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<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="notes">
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## Notes
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- If a substring is not present in a provided string, the function returns an empty string.
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- If provided an empty substring, the function returns an empty string.
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</section>
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<!-- /.notes -->
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<!-- Package usage examples. -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var substringAfterLast = require( '@stdlib/string/substring-after-last' );
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var str = 'To be, or not to be, that is the question.';
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var out = substringAfterLast( str, ', ' );
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// returns 'that is the question.'
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out = substringAfterLast( str, 'to be' );
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// returns ', that is the question.'
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out = substringAfterLast( str, 'question.' );
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// returns ''
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out = substringAfterLast( str, 'xyz' );
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// returns ''
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out = substringAfterLast( str, '' );
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// returns ''
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```
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</section>
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<!-- /.examples -->
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<!-- Section for describing a command-line interface. -->
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* * *
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<section class="cli">
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## CLI
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<!-- CLI usage documentation. -->
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<section class="usage">
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### Usage
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```text
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Usage: substring-after-last [options] --search=<string> [<string>]
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Options:
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-h, --help Print this message.
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-V, --version Print the package version.
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--search string Search string.
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--from-index int Index at which to start the search.
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--split sep Delimiter for stdin data. Default: '/\\r?\\n/'.
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```
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</section>
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<!-- /.usage -->
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<!-- CLI usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="notes">
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### Notes
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- If the split separator is a [regular expression][mdn-regexp], ensure that the `split` option is either properly escaped or enclosed in quotes.
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```bash
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# Not escaped...
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$ echo -n $'foo\nbar\nbaz' | substring-after-last --search a --split /\r?\n/
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# Escaped...
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$ echo -n $'foo\nbar\nbaz' | substring-after-last --search a --split /\\r?\\n/
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```
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- The implementation ignores trailing delimiters.
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</section>
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<!-- /.notes -->
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<!-- CLI usage examples. -->
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<section class="examples">
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### Examples
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```bash
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$ substring-after-last abcdefg --search d
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efg
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```
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To use as a [standard stream][standard-streams],
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```bash
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$ echo -n $'bar\nbaz' | substring-after-last --search b
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ar
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az
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```
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By default, when used as a [standard stream][standard-streams], the implementation assumes newline-delimited data. To specify an alternative delimiter, set the `split` option.
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```bash
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$ echo -n 'bar\tbaz' | substring-after-last --search b --split '\t'
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ar
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az
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```
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</section>
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<!-- /.examples -->
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</section>
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<!-- /.cli -->
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<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="references">
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</section>
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<!-- /.references -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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* * *
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## See Also
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- <span class="package-name">[`@stdlib/string/substring-before`][@stdlib/string/substring-before]</span><span class="delimiter">: </span><span class="description">return the part of a string before a specified substring.</span>
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- <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>
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- <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>
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</section>
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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[standard-streams]: https://en.wikipedia.org/wiki/Standard_streams
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[mdn-regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
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<!-- <related-links> -->
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[@stdlib/string/substring-before]: https://github.com/stdlib-js/string/tree/main/substring-before
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[@stdlib/string/substring-before-last]: https://github.com/stdlib-js/string/tree/main/substring-before-last
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[@stdlib/string/substring-after]: https://github.com/stdlib-js/string/tree/main/substring-after
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<!-- </related-links> -->
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</section>
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<!-- /.links -->
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