README.md (6421B)
1 <!-- 2 3 @license Apache-2.0 4 5 Copyright (c) 2021 The Stdlib Authors. 6 7 Licensed under the Apache License, Version 2.0 (the "License"); 8 you may not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an "AS IS" BASIS, 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18 19 --> 20 21 # substringAfter 22 23 > Return the part of a string after a specified substring. 24 25 <!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. --> 26 27 <section class="intro"> 28 29 </section> 30 31 <!-- /.intro --> 32 33 <!-- Package usage documentation. --> 34 35 <section class="usage"> 36 37 ## Usage 38 39 ```javascript 40 var substringAfter = require( '@stdlib/string/substring-after' ); 41 ``` 42 43 #### substringAfter( str, search\[, fromIndex] ) 44 45 Returns the part of a string after a specified substring. 46 47 ```javascript 48 var str = 'beep boop'; 49 var out = substringAfter( str, 'o' ); 50 // returns 'op' 51 52 out = substringAfter( str, ' ' ); 53 // returns 'boop' 54 ``` 55 56 By default, the search starts at the beginning of the string. To start searching from a different index, provide a `fromIndex` argument: 57 58 ```javascript 59 var str = 'boop baz boop'; 60 var out = substringAfter( str, 'o', 3 ); 61 // returns 'op' 62 ``` 63 64 </section> 65 66 <!-- /.usage --> 67 68 <!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. --> 69 70 <section class="notes"> 71 72 ## Notes 73 74 - If a substring is not present in a provided string, the function returns an empty string. 75 - If provided an empty substring, the function returns the input string. 76 - If `fromIndex` is less than `0` or greater than `str.length`, the search starts at index `0` and `str.length`, respectively. 77 78 </section> 79 80 <!-- /.notes --> 81 82 <!-- Package usage examples. --> 83 84 <section class="examples"> 85 86 ## Examples 87 88 <!-- eslint no-undef: "error" --> 89 90 ```javascript 91 var substringAfter = require( '@stdlib/string/substring-after' ); 92 93 var str = 'To be, or not to be, that is the question.'; 94 var out = substringAfter( str, ', ' ); 95 // returns 'or not to be, that is the question.' 96 97 out = substringAfter( str, 'to be' ); 98 // returns ', that is the question.' 99 100 out = substringAfter( str, 'question.' ); 101 // returns '' 102 103 out = substringAfter( str, 'xyz' ); 104 // returns '' 105 106 out = substringAfter( str, '' ); 107 // returns 'To be, or not to be, that is the question.' 108 ``` 109 110 </section> 111 112 <!-- /.examples --> 113 114 <!-- Section for describing a command-line interface. --> 115 116 * * * 117 118 <section class="cli"> 119 120 ## CLI 121 122 <!-- CLI usage documentation. --> 123 124 <section class="usage"> 125 126 ### Usage 127 128 ```text 129 Usage: substring-after [options] --search=<string> [<string>] 130 131 Options: 132 133 -h, --help Print this message. 134 -V, --version Print the package version. 135 --search string Search string. 136 --from-index int Start index. Default: 0. 137 --split sep Delimiter for stdin data. Default: '/\\r?\\n/'. 138 ``` 139 140 </section> 141 142 <!-- /.usage --> 143 144 <!-- CLI usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. --> 145 146 <section class="notes"> 147 148 ### Notes 149 150 - If the split separator is a [regular expression][mdn-regexp], ensure that the `split` option is either properly escaped or enclosed in quotes. 151 152 ```bash 153 # Not escaped... 154 $ echo -n $'foo\nbar\nbaz' | substring-after --search a --split /\r?\n/ 155 156 # Escaped... 157 $ echo -n $'foo\nbar\nbaz' | substring-after --search a --split /\\r?\\n/ 158 ``` 159 160 - The implementation ignores trailing delimiters. 161 162 </section> 163 164 <!-- /.notes --> 165 166 <!-- CLI usage examples. --> 167 168 <section class="examples"> 169 170 ### Examples 171 172 ```bash 173 $ substring-after abcdefg --search d 174 efg 175 ``` 176 177 To use as a [standard stream][standard-streams], 178 179 ```bash 180 $ echo -n $'bar\nbaz' | substring-after --search b 181 ar 182 az 183 ``` 184 185 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. 186 187 ```bash 188 $ echo -n 'bar\tbaz' | substring-after --search b --split '\t' 189 ar 190 az 191 ``` 192 193 </section> 194 195 <!-- /.examples --> 196 197 </section> 198 199 <!-- /.cli --> 200 201 <!-- 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. --> 202 203 <section class="references"> 204 205 </section> 206 207 <!-- /.references --> 208 209 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. --> 210 211 <section class="related"> 212 213 * * * 214 215 ## See Also 216 217 - <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> 218 - <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> 219 - <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> 220 221 </section> 222 223 <!-- /.related --> 224 225 <!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. --> 226 227 <section class="links"> 228 229 [standard-streams]: https://en.wikipedia.org/wiki/Standard_streams 230 231 [mdn-regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions 232 233 <!-- <related-links> --> 234 235 [@stdlib/string/substring-before]: https://github.com/stdlib-js/string/tree/main/substring-before 236 237 [@stdlib/string/substring-before-last]: https://github.com/stdlib-js/string/tree/main/substring-before-last 238 239 [@stdlib/string/substring-after-last]: https://github.com/stdlib-js/string/tree/main/substring-after-last 240 241 <!-- </related-links> --> 242 243 </section> 244 245 <!-- /.links -->