![]() Output: "Hello Python World, I am diving into the Python world. It was good to learn JavaScript." Ĭonst pattern = new RegExp('\javascript', 'gi') Ĭonsole.log(p.replace(pattern, "Python")) let p = "Hello JavaScript World, I am diving into the javascript world. Following is an example of the constructor function. Otherwise, it is good to use the constructor function if we suspect that the pattern will be changed. This notation is used when we know that the pattern will remain constant. Till now, we have studied the literal notation of regex. Using the following sample code, we can see that it is also possible to find patterns at the end of each line and replace them with the desired value. If we remove the m flag from the above example, it will only replace the pattern on the first line (see the following code). Let result = p.replace(pattern, "ListItem") The m flag not only matches at the start using ^ and the end of each line using the $ symbol, but it can also match the start/end of a line. What if we have a single string spread on multiple lines? Here, the m flag comes into the action and does a multiline match. We can use the i flag with the g flag if we want to replace that also. ![]() It’s why javascript is not replaced in the above output. Remember, the g flag does a case-sensitive match. Output: "Hello Python World, I am diving into the javascript world. Now, what if we have more than one sentence or string? We use the g modifier that performs a global match and replaces all matching words/patterns.Įxample Code: let p = "Hello JavaScript World, I am diving into the javascript world. It’s because of the i flag, but it also stops after the first match. See, the first JavaScript word is replaced with Python, although we were trying to match lower-case javascript. Let result = p.replace(pattern, "Python") The test() method checks and returns true if the pattern exists. We use the i flag to search with case-insensitivity, which means World and world are the same. Replace With Regex (Regular Expression) in JavaScript This limitation leads to regular expressions with modifiers, also known as flags. In the output given above, we can observe that the replace() function stops after replacing the first match. Output: "Hello Python World, I am diving into the javascript world." ![]() We can perform a global, multiline, or case-insensitive match using regex to replace the string.Įxample Code: let p = "Hello JavaScript World, I am diving into the javascript world."Ĭonsole.log(p.replace("JavaScript", "Python")) It is why we use regular expressions to meet our needs for validating text and searching through text. This function replaces the first match and then stops. The replace() function searches for a string and replaces it with a new string without changing the original string. Sometimes, we want to replace particular words in a string or write a regular expression (also known as regex) to replace a pattern with a new value.įor that, we can get the advantage of the replace() function if we have a small string or can use the RegExp object’s methods to find a pattern in a long string (paragraphs) and replace it with new words/values.
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