How to substring a string in JavaScript?

JavaScript String substring() Method The substring() method extracts the characters from a string, between two specified indices, and returns the new sub string. This method extracts the characters in a string between “start” and “end”, not including “end” itself. If “start” is greater than “end”, this method will swap the two arguments

When to use slice and substring in JavaScript?

The slice method also expects the same two parameters: If we don’t set an ending index, then we get a substring starting from the given index number until the end of the original string: If we set both the startIndex and the endIndex, then we will get the characters between the given index numbers of the original string:

What is the index of a substring in JavaScript?

The index of the first character to include in the returned substring. The index of the first character to exclude from the returned substring. A new string containing the specified part of the given string.

Which is the most common substring in JavaScript?

Fortunately, there are many built-in methods in JavaScript that help us while working with arrays, strings and other data types. We can use these methods for various operations like searching, replacing, concatenating strings, and so on. Getting a substring from a string is one of the most common operations in JavaScript.

How to replace a string in JavaScript with regex?

To use RegEx, the first argument of replace will be replaced with regex syntax, for example /regex/. This syntax serves as a pattern where any parts of the string that match it will be replaced with the new substring. The string 3foobar4 matches the regex /d.*d/, so it is replaced.

Which is part of the string does substring ( ) return?

The substring() method returns the part of the string between the start and end indexes, or to the end of the string.

When to use substring, substr and slice?

The negative index to slice indicates you want to stop or start that many characters from the end of the string. All negative numbers are converted to 0 in substring. The JavaScript String substring, substr and slice methods can all extract portions of a string based on position.