feat(contains): add possibility to check that string contains seed mu…

…ltiple times (#1836)

* Added feature to require minimum number of occurrences for the seed in 'contains'

* Changed regex to split

Co-authored-by: Markus Tyrkkö <markus.tyrkko@nitor.com>
Co-authored-by: Markus <markus.tyrkko@gmail.com>

README.md

@@ -88,7 +88,7 @@ Here is a list of the validators currently available.
 
 Validator                               | Description
 --------------------------------------- | --------------------------------------
-**contains(str, seed [, options ])**    | check if the string contains the seed.<br/><br/>`options` is an object that defaults to `{ ignoreCase: false}`.<br/>`ignoreCase` specified whether the case of the substring be same or not.
+**contains(str, seed [, options ])**    | check if the string contains the seed.<br/><br/>`options` is an object that defaults to `{ ignoreCase: false, minOccurrences: 1 }`.<br />Options: <br/> `ignoreCase`: Ignore case when doing comparison, default false<br/>`minOccurences`: Minimum number of occurrences for the seed in the string. Defaults to 1.
 **equals(str, comparison)**             | check if the string matches the comparison.
 **isAfter(str [, date])**               | check if the string is a date that's after the specified date (defaults to now).
 **isAlpha(str [, locale, options])**    | check if the string contains only letters (a-zA-Z).<br/><br/>Locale is one of `['ar', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-LB', 'ar-LY', 'ar-MA', 'ar-QA', 'ar-QM', 'ar-SA', 'ar-SD', 'ar-SY', 'ar-TN', 'ar-YE', 'bg-BG', 'cs-CZ', 'da-DK', 'de-DE', 'el-GR', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'es-ES', 'fa-IR', 'fi-FI', 'fr-CA', 'fr-FR', 'he', 'hi-IN', 'hu-HU', 'it-IT', 'ku-IQ', 'nb-NO', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-BR', 'pt-PT', 'ru-RU', 'sl-SI', 'sk-SK', 'sr-RS', 'sr-RS@latin', 'sv-SE', 'tr-TR', 'uk-UA']`) and defaults to `en-US`. Locale list is `validator.isAlphaLocales`. options is an optional object that can be supplied with the following key(s): ignore which can either be a String or RegExp of characters to be ignored e.g. " -" will ignore spaces and -'s.

src/lib/contains.js

@@ -4,12 +4,16 @@ import merge from './util/merge';
 
 const defaulContainsOptions = {
   ignoreCase: false,
+  minOccurrences: 1,
 };
 
 export default function contains(str, elem, options) {
   assertString(str);
   options = merge(options, defaulContainsOptions);
-  return options.ignoreCase ?
-    str.toLowerCase().indexOf(toString(elem).toLowerCase()) >= 0 :
-    str.indexOf(toString(elem)) >= 0;
+
+  if (options.ignoreCase) {
+    return str.toLowerCase().split(toString(elem).toLowerCase()).length > options.minOccurrences;
+  }
+
+  return str.split(toString(elem)).length > options.minOccurrences;
 }

test/validators.js

@@ -4327,6 +4327,15 @@ describe('Validators', () => {
       valid: ['Foo', 'FOObar', 'BAZfoo'],
       invalid: ['bar', 'fobar', 'baxoof'],
     });
+
+    test({
+      validator: 'contains',
+      args: ['foo', {
+        minOccurrences: 2,
+      }],
+      valid: ['foofoofoo', '12foo124foo', 'fofooofoooofoooo', 'foo1foo'],
+      invalid: ['foo', 'foobar', 'Fooofoo', 'foofo'],
+    });
   });
 
   it('should validate strings against a pattern', () => {