{"id":594,"date":"2009-04-30T11:56:05","date_gmt":"2009-04-30T01:56:05","guid":{"rendered":"https:\/\/eisabainyo.net\/weblog\/?p=594"},"modified":"2009-04-30T12:09:15","modified_gmt":"2009-04-30T02:09:15","slug":"10-examples-of-basic-input-validation-in-javascript","status":"publish","type":"post","link":"https:\/\/eisabainyo.net\/weblog\/2009\/04\/30\/10-examples-of-basic-input-validation-in-javascript\/","title":{"rendered":"10 Examples of Basic Input Validation in Javascript"},"content":{"rendered":"<pre>\r\nvar input = \"hello222\";\r\nvar ok = false;\r\n\r\nvar dob_regex = \/^([0-9]){2}(\\\/){1}([0-9]){2}(\\\/)([0-9]){4}$\/;   \/\/ DD\/MM\/YYYY\r\nvar email_regex = \/^[a-zA-Z0-9._-]+@([a-zA-Z0-9.-]+\\.)+[a-zA-Z0-9.-]{2,4}$\/;  \/\/ email address\r\nvar username_regex = \/^[\\w.-]+$\/;  \/\/ allowed characters: any word . -, ( \\w ) represents any word character (letters, digits, and the underscore _ ), equivalent to [a-zA-Z0-9_]\r\nvar num_regex = \/^\\d+$\/; \/\/ numeric digits only\r\nvar search_regex = \"\/hello\/\"; \r\nvar password_regex = \/^[A-Za-z\\d]{6,8}$\/;  \/\/ any upper\/lowercase characters and digits, between 6 to 8 characters in total\r\nvar phone_regex = \/^\\(\\d{3]\\) \\d{3}-\\d{4}$\/;  \/\/ (xxx) xxx-xxxx  \r\nvar question_regex = \/\\?$\/; \/\/ ends with a question mark\r\n\r\n<\/pre>\n<p><strong>1. Check that there are at least 3 numeric characters in input <\/strong><\/p>\n<pre>\r\nif ( input.match(\/d\/g) == null ) {\r\n\t ok = false;\r\n} else if ( input.match(\/d\/g).length < 3 )  {\r\n\t ok = false;\t\r\n} else {\r\n\t ok = true;\t\r\n}\r\n<\/pre>\n<p><strong>2. Check that the input has a minimum of 8 characters<\/strong><\/p>\n<pre>\r\nif ( input.length >= 8 ) {\r\n\t ok = true;\t\r\n}\r\n<\/pre>\n<p><strong>3. Check that the input is in a correct date format (DD\/MM\/YYYY)<\/strong><\/p>\n<pre>\r\nif ( dob_regex.test(input) ) {\r\n\tok = true;\t\r\n}\r\n<\/pre>\n<p><strong>4. Check that the input is in a correct email format (username@example.com)<\/strong><\/p>\n<pre>\r\nif ( email_regex.test(input) ) {\r\n\tok = true;\t\r\n}\r\n<\/pre>\n<p><strong>5.  Check that the input matches the specified username format <\/strong><\/p>\n<pre>\r\nif ( username_regex.test(input) ) {\r\n\tok = true;\t\r\n}\r\n<\/pre>\n<p><strong>6. Check that the input contains only numeric characters<\/strong><\/p>\n<pre>\r\nif ( input.match(num_regex) ) {\r\n\tok = true;\t\r\n}\r\n<\/pre>\n<p><strong>7. Search for a specific word in the input<\/strong><\/p>\n<pre>\r\nif ( input.search(search_regex) != -1 ) {\r\n\tok = true;\t\r\n}\r\n<\/pre>\n<p><strong>8. Check that the input matches the specified password format <\/strong><\/p>\n<pre>\r\nif ( input.match(password_regex) ) {\r\n\tok = true;\t\r\n}\r\n<\/pre>\n<p><strong>9. Check that the input matches the specified phone number format <\/strong><\/p>\n<pre>\r\nif ( input.match(phone_regex) ) {\r\n\tok = true;\t\r\n}\r\n<\/pre>\n<p><strong>10. Check that the input is a question (ends with a question mark)<\/strong><\/p>\n<pre>\r\nif ( question_regex.test(input) ) {\r\n\tok = true;\t\r\n}\r\n<\/pre>\n<p>To test the Regular Expressions (RegEx) mentioned in this blog, you can use <a href=\"http:\/\/www.eightize.com\/sw\/j\/testRE.html\">this tool<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>var input = &#8220;hello222&#8221;; var ok = false; var dob_regex = \/^([0-9]){2}(\\\/){1}([0-9]){2}(\\\/)([0-9]){4}$\/; \/\/ DD\/MM\/YYYY var<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,11],"tags":[],"class_list":["post-594","post","type-post","status-publish","format-standard","hentry","category-snippets","category-tutorials"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>10 Examples of Basic Input Validation in Javascript | Tech Leadership Advice &amp; 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