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Before learning how to extract a number from a JS string, we should look at some information below.
Let’s practice a few techniques to understand how to go about it.
In the script below, there is the string value, including the number (1444231), which the string value would store in the string_contain_number variable.
Then attaching the match() method to the variable, include \d+ as an argument to make it look as match(/\d+/).
To locate a digit in a string, use the d metacharacter. To find a consecutive sequence of digits, we add the + to \d.
\d+ is a metacharacter in regular expressions (RegEx) that means “match 1 or more digits”.
The syntax of match() method:
Parameters: The parameter, in this case, is “regExp” (regular expression), which will compare with the given string.
Here is all the code:
A string is compared to a regular expression using the String match() method, which then gives the results. Since the first element of the array in our case is the matched number, we access the 0 property using bracket notation to obtain it.
The syntax of replace() Method:
pattern: A string or an object with a Symbol can be used. A regular expression is a common example of the replace method. Any value without the Symbol.replace method will be converted to a string.
replacement: It can be either a string or a function. If it is a string, it will replace the substring that pattern matches. A variety of special replacement patterns are supported; see the section Specifying a string as the replacement below for more information.
Take a look at the example below:
Any non-digit characters in a string are matched by the D metacharacter of regex.
The g flag instructs the regex to match each instance of a character other than a digit in the string.
Unless the global flag is supplied, the input string’s first non-digit character would be detected and swapped.
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