![]() ![]() 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. Output: "Hello Python World, I am diving into the Python world. let p = "Hello JavaScript World, I am diving into the javascript world. 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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