String contains js6/29/2023 ![]() Note that cached RegExp is: var r = new RegExp('simple') var c = r.test(str) as opposed to: /simple/. Just to save people from running the tests themselves, here are the current results for most common browsers, the percentages indicate performance increase over the next fastest result (which varies between browsers): For example a case-insensitive search is way faster with regular expressions. ![]() While in Chrome 10 indexOf seems to be faster, in Safari 5, indexOf is clearly slower than any other method. ![]() The differences between the browsers is enormous. Here, we have used 4 paragraphs for demonstration and two paragraphs are given same class names for giving an idea about the code functioning. It cannot be said with certainty which method is faster. In this case, we will use the contains () Method in jQuery to find the single or multiple paragraphs which contain the desired word or substring. Returns true if the characters exist and false if not. Regular expressions seem to be faster (at least in Chrome 10). The contains () method checks whether a string contains a sequence of characters. The test () method will return true if the string contains only numbers. Regular expression: (new RegExp('word')).test(str) To check if a string contains only numbers in JavaScript, call the test () method on this regular expression: \d .
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