How to match this specific string using regex in javascript and if its matched then make it empty

Here'e the regex you want:

/(\/\/\/ cache ml\/\d\/\d{5}_..\.(png|jpg))+/i

• / is a special character so we have to escape it like this \/
• cache ml\/3\/\ this part will match "cache ml\3\" exactly assuming its a stable
• \d{5} will match any 5 digits
• .. matches any 2 characters
• . is a special character so we have to escape it like this \.
• (png|jpg) will match png or jpg
• we group the whole thing in a group () and use + this mean one or more so the regex will match any number of repetitions above one, not just 3 as your example
• we use i at the end to make the regex case insensitive.

Now that we have the regex, we use it like this

var myString = "/// cache ml/\d/11204_gb.png/// cache ml/3/16917_ar.png/// cache ml/3/52871_au.jpg"
var myRegex = /(\/\/\/ cache ml\/3\/\d{5}_..\.(png|jpg))+/i
var newString = myString.replace(myRegex, "")

to make the matching more loss when it comes to filenames you can replace d{5}_.. with .* so the regex becomes:

/(\/\/\/ cache ml\/\d\/.*\.(png|jpg))+/i

this will natch any file name with png or jpg extension.

Thanks all finally I fix the regex and here it is

var text = scriptValue.replace(/(\/\/\/ cache ml\/\d\/[a-zA-Z0-9_]*\.(png|jpg|jpeg|gif))+/i, '');