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I am using regex in javascript and want to replace all the digits in a number except the last four with '#'. I have figured out how to replace all the digits with '#', what do I do to not replace the last four? Here is my code so far. return cc.replace(/[0-9]/g, "#")
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To match a literal space, you'll need to escape it: "\\ " . This is a useful way of describing complex regular expressions: phone <- regex(" \\(? #
RegEx can be effectively used to recreate patterns. So combining this with . replace means we can replace patterns and not just exact characters.
To remove all characters except numbers in javascript, call the replace() method, passing it a regular expression that matches all non-number characters and replace them with an empty string. The replace method returns a new string with some or all of the matches replaced.
For example, the replacement pattern $1 indicates that the matched substring is to be replaced by the first captured group.
use this pattern
\d(?=\d{4})
and replace with #
Demo
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