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Frequently Asked Questions

What are regular expressions in JavaScript?

In JavaScript, regular expressions are also objects. These patterns are used with the exec and test methods of RegExp, and with the match, matchAll, replace, search, and split methods of String.

What is a regex object?

RegExp Object. A regular expression is an object that describes a pattern of characters. Regular expressions are used to perform pattern-matching and "search-and-replace" functions on text.

How to debugger regexp?

Here's another one with which you can even debugger regexp: Online regex tester and debugger. Another one: RegExr. var value = '675-805-714'; var numberPattern = /\d+/g; value = value.match ( numberPattern ).join ( []); alert (value); //Show: 675805714 I guess you want to get number (s) from the string. In which case, you can use the following:

How to add escape strings to a regular expression?

If escape strings are not already part of your pattern you can add them using String.replace: The "g" after the regular expression is an option or flag that performs a global search, looking in the whole string and returning all matches. It is explained in detail below in Advanced Searching With Flags.


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