{"id":4661,"date":"2021-04-29T12:24:17","date_gmt":"2021-04-29T06:54:17","guid":{"rendered":"https:\/\/python-programs.com\/?p=4661"},"modified":"2021-11-22T18:42:59","modified_gmt":"2021-11-22T13:12:59","slug":"python-check-if-a-string-contains-a-sub-string-case-insensitive","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-check-if-a-string-contains-a-sub-string-case-insensitive\/","title":{"rendered":"Python : Check if a String contains a Sub String | Case Insensitive"},"content":{"rendered":"<p>Strings are one of the most commonly used types in Python. We can easily make them by enclosing characters in quotes. Python considers single quotes to be the same as double quotes. String creation is as easy as assigning a value to a variable.<\/p>\n<p>Let&#8217;s look at different ways to solve the general problem of determining whether a specific piece of string is present in a larger string. This is a very common type of problem that every programmer encounters at least once in his or her career. This article discusses various methods for resolving it.<\/p>\n<p>Given a string and substring ,the task is to check if the substring is present in given string.<\/p>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>1)Case sensitive<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>string = 'This is BTechGeeks online platform'\u00a0 substring = 'online'<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Yes<\/pre>\n<p><strong>2)Case insensitive<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>string = 'This is BTechGeeks Online platform'\u00a0 substring = 'online'<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Yes<\/pre>\n<h2>Determine whether a String contains a Sub String<\/h2>\n<p>There are several ways to check whether a string contains given substring some of them are:<\/p>\n<ul>\n<li><a href=\"#Using_in_operator\">Using in operator<\/a><\/li>\n<li><a href=\"#Using_not_in_operator\">Using not in operator<\/a><\/li>\n<li><a href=\"#Using_str.find()\">Using str.find()<\/a><\/li>\n<li><a href=\"#Using_index()_function\">Using index() function<\/a><\/li>\n<\/ul>\n<h3 id=\"Using_in_operator\">Method #1:Using in operator<\/h3>\n<p>The in operator is the most generic and fastest way to check for a substring in Python. The power of the in operator in Python is well known and is used in many operations throughout the language.<\/p>\n<p><strong>1)Case sensitive<\/strong><\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># given string\r\nstring = 'This is BTechGeeks online platform'\r\n# given substring\r\nsubstring = 'online'\r\n# checking if the substring is present in string\r\nif substring in string:\r\n    print('Yes')\r\nelse:\r\n    print('No')\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Yes<\/pre>\n<p><strong>2)Case Insensitive<\/strong><\/p>\n<p>We can check them by converting both given string and substring to lower case or uppercase.<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># given string\r\nstring = 'This is BTechGeeks Online platform'\r\n# given substring\r\nsubstring = 'online'\r\n# checking if the substring is present in string by converting to lowercase\r\nif substring.lower() in string.lower():\r\n    print('Yes')\r\nelse:\r\n    print('No')\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Yes<\/pre>\n<h3 id=\"Using_not_in_operator\">Method #2: Using not in operator<\/h3>\n<p>Similarly, we can use the \u201cnot in\u201d operator to test the opposite scenario, that is, to see if a string or character does not exist in another string.<\/p>\n<p><strong>1)Case sensitive<\/strong><\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># given string\r\nstring = 'This is BTechGeeks online platform'\r\n# given substring\r\nsubstring = 'online'\r\n# checking if the substring is present in string\r\nif substring not in string:\r\n    print('No')\r\nelse:\r\n    print('Yes')\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Yes<\/pre>\n<p><strong>2)Case insensitive<\/strong><\/p>\n<p>We can check them by converting both given string and substring to lower case or uppercase.<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># given string\r\nstring = 'This is BTechGeeks online platform'\r\n# given substring\r\nsubstring = 'online'\r\n# checking if the substring is present in string by converting to lowercase\r\nif substring.lower() not in string.lower():\r\n    print('No')\r\nelse:\r\n    print('Yes')\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Yes<\/pre>\n<h3 id=\"Using_str.find()\">Method #3:Using str.find()<\/h3>\n<p>The str.find() method is generally used to get the lowest index at which the string occurs, but it also returns -1 if the string is not present; thus, if any value returns greater than zero, the string is present; otherwise, it is not present.<\/p>\n<p><strong>1)Case sensitive<\/strong><\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># given string\r\nstring = 'This is BTechGeeks online platform'\r\n# given substring\r\nsubstring = 'online'\r\n# using find operator\r\nresult = string.find(substring)\r\n# if result is greater than 0 then print yes\r\nif result &gt; 0:\r\n    print('Yes')\r\nelse:\r\n    print('No')\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Yes<\/pre>\n<p><strong>2)Case insensitive<\/strong><\/p>\n<p>We can check them by converting both given string and substring to lower case or uppercase.<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># given string to lower\r\nstring = 'This is BTechGeeks Online platform'.lower()\r\n# given substring to lower\r\nsubstring = 'online'.lower()\r\n# using find operator\r\nresult = string.find(substring)\r\n# if result is greater than 0 then print yes\r\nif result &gt; 0:\r\n    print('Yes')\r\nelse:\r\n    print('No')\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Yes<\/pre>\n<h3 id=\"Using_index()_function\">Method #4:Using index() function<\/h3>\n<p>This method can be used to perform the same task as str.find(), but unlike str.find(), it does not return a value, but rather a ValueError if string is not present, so catching the exception is the only way to check for string in substring.<\/p>\n<p><strong>1)Case sensitive<\/strong><\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># given string\r\nstring = 'This is BTechGeeks Online platform'\r\n# given substring\r\nsubstring = 'online'\r\n# using try and except\r\n# using index function\r\ntry:\r\n    result = string.find(substring)\r\n    print('Yes')\r\nexcept:\r\n    print('No')\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Yes<\/pre>\n<p><strong>2)Case insensitive<\/strong><\/p>\n<p>We can check them by converting both given string and substring to lower case or uppercase.<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># given string to lower\r\nstring = 'This is BTechGeeks Online platform'.lower()\r\n# given substring to lower\r\nsubstring = 'online'.lower()\r\n# using try and except\r\n# using index function\r\ntry:\r\n    result = string.find(substring)\r\n    print('Yes')\r\nexcept:\r\n    print('No')\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Yes<\/pre>\n<p><strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/check-if-type-of-a-variable-is-string-in-python\/\">check if type of a variable is string in python<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-check-if-a-list-contains-all-the-elements-of-another-list\/\">python check if a list contains all the elements of another list<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-check-if-a-string-is-palindrome-or-not\/\">python program to check if a string is palindrome or not<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-check-if-a-string-is-a-pangram-or-not\/\">python program to check if a string is a pangram or not<\/li>\n<li><a href=\"https:\/\/python-programs.com\/find-all-occurrences-of-a-sub-string-in-a-string-cpp-both-case-sensitive-insensitive\/\">find all occurrences of a sub string in a string cpp both case sensitive insensitive<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-check-if-a-substring-is-present-in-a-given-string\/\">python program to check if a substring is present in a given string<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-check-if-a-value-exists-in-the-dictionary\/\">python check if a value exists in the dictionary<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Strings are one of the most commonly used types in Python. We can easily make them by enclosing characters in quotes. Python considers single quotes to be the same as double quotes. String creation is as easy as assigning a value to a variable. Let&#8217;s look at different ways to solve the general problem of &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-check-if-a-string-contains-a-sub-string-case-insensitive\/\"> <span class=\"screen-reader-text\">Python : Check if a String contains a Sub String | Case Insensitive<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":4726,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python : Check if a String contains a Sub String | Case Insensitive - Python Programs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/python-programs.com\/python-check-if-a-string-contains-a-sub-string-case-insensitive\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python : Check if a String contains a Sub String | Case Insensitive - Python Programs\" \/>\n<meta property=\"og:description\" content=\"Strings are one of the most commonly used types in Python. 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