Node.js Asynchronous replace on string

Question

I am using node.js and express.

I have a string similar to the following:

Here is my string but now I need to processString("mystring") 
and return the processString("data").

I want to search for all occurrences of processString and replace it with the results of a function. The function I need to run is asynchronous. Is there an easy way to do this?

Thanks!

Okay, so this is what I'm thinking I should do. Let me know if you think this is the right way or any better: 1. Do a regex match on processString 2. async.forEach over results 3. Do a string replace the regex match with the results from processString Does this seem right? — Christie
– Christie, Commented Nov 9, 2012 at 23:27

Sdedelbrock · Accepted Answer · 2012-11-10 01:54:28Z

1

Your question isn't really to clear, the "why" and "what" may be more helpfull in answering your question. From what I understand you want to replace processString("****") with **** in which case you can use the following:

    var str = 'Here is my string but now I need to processString("mystring") and return the processString("data").'
    str = str.replace(/processString\(\".*?\"\)/gi, function(match){
         return match.replace("processString\(\"", "").replace("\"\)", "")
    })
    console.log(str);

This will match the processString("****") inner contents, hope this is what you were looking for!

answered Nov 10, 2012 at 1:54

Sdedelbrock

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3 Comments

Christie Over a year ago

Sorry, I tried to figure out how to make it as clear as possible, the parameter of the method needs to be processed by a function (processString) and it queries a database. As the argument is from the user and can be anything, I can't avoid the database call. So, the function that gets called has to be asynchronous. Does that make sense?

Sdedelbrock Over a year ago

I think I understand the question, however the source would help. With the understanding I have you can use case .replace() which is non blocking, so you can pass whatever paramaters you need through the callback, I think this would be the best way to iterate over the items in the string. You could also avoid multiple queries by building a query index (collect all parameters), doing one query, and then replacing each result accordingly.

Christie Over a year ago

I don't have any code for it yet as I'm trying to figure out the best way for it to work. If I use replace, is there a way to know when it is done so I can call the function's callback?

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