String Replacer

String Replace Replaceall
String Replace Javascript

The C Standard Library

The C++ Standard Library

The Java string replace method will replace a character or substring with another character or string. The syntax for the replace method is stringname.replace(oldstring, newstring) with oldstring being the substring you’d like to replace and newstring being the substring that will take its place. Useful, free online tool that finds and replaces words in a string or a text blob. No ads, nonsense or garbage, just a string replacer. Press button, get result. About Replace text online tool Replace text that you enter or paste into the Input window with the value that you place into the “Find text” field. This “Replace text” feature is not case sensitive. If you put the word “red” into the “Find text” field you will replace “red” and not “Red” where it appears.

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Description

It replaces the portion of the string that begins at character pos and spans len characters.

Declaration

Following is the declaration for std::string::replace.

C++11

C++14

Parameters

pos − It is an insertion point.
str − It is a string object. State farm driving safety record rate level 6.
len − It contains information about number of characters to erase.

Return Value

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Exceptions

if an exception is thrown, there are no changes in the string.

Example

In below example for std::string::replace.

The sample output should be like this −

string.htm

Summary: in this tutorial, you’ll how to use JavaScript String replace() method to replace a substring in a string with a new one.

Introduction to the JavaScript String replace() method

String Replace Replaceall

The following shows the syntax of the replace() method:

The JavaScript String replace() method returns a new string with a substring (substr) replaced by a new one (newSubstr).

Note that the replace() method doesn’t change the original string. It returns a new string.

JavaScript String replace() examples

String Replace Javascript

The following example uses the replace() to replace the JS in the string 'JS will, JS will rock you' wit the new substring JavaScript:

Output:

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As you can see from the output, only the first occurrence of the substring JS was replaced with the new substring JavaScript.

To replace all occurrences of a substring in a string with a new one, you must use a regular expression.

Using regular expressions

The replace() method fully supports regular expressions:

In this syntax, the replace() method find all matches in the str, replaces them by the newSubstr, and returns a new string (newStr).

The following example uses the global flag (g) to replace all occurrences of the JS in the str by the JavaScript:

Output:

If you want to ignore cases for searching and replacement, you can use the ignore flag (i) in the regular expression like this:

Output:

Using a replacement function

Instead of passing a newSubstr to the second parameter of the replace() method, you can pass a replacement function as follows:

In this syntax, the replace() method will invoke the replacer function after the match has been performed. It then uses the result of this function as the replacement string.

If you use the global flag (g) in the regular expression, the replace() method will invoke the replacer function for every match. For example, if there are three matches, the replace() method will invoke the replacer() function three times.

The replacer() function has the following syntax:

The following are the meaning of each parameter:

match: is the matched substring.
p1, p2, …pn are the nth string found by a parenthesized capture group provided by the regular expression.
offset: is the offset of the matched substring within the whole string being searched.
string: is the whole string being examined.

The following example uses the replace() function to change the substrings apples and bananas to uppercase. It passes a replacer function into the replace() function:

Output:

Summary

Use the replace() method to return a new string with a substring replaced by a new one.
Use a regular expression with the global flag (g) to replace all occurrences of a substring with a new one.

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