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I have a question about my javascript.

i have something retrieved from my DB like this:

lots of texts in line 1 
lots of texts in line 2
lots of texts in line 3 
lots of texts in line 4

I want to create an array and create elements based on the breakline.

I have something like

var contents = obj.string //obj.string contains the contents above.
contents = contents.split(/(\r\n|\r|\n)/g)

It created more than 4 elements because some elements are just a 'breakline'.

Can anyone help me to get just 4 elements? Thanks so much!

Chris Rymer
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FlyingCat
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  • possible duplicate of [Reference - What does this regex mean?](http://stackoverflow.com/questions/22937618/reference-what-does-this-regex-mean) – bjb568 Jun 09 '14 at 21:18
  • anyway you can loop through the elements and remove the empty elements (after trimming), then you should have only 4 elements remaining. – King King Jun 09 '14 at 21:20
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    @bjb568 Not sure how this is a duplicate of your linked question? – Alex Jun 09 '14 at 21:30

2 Answers2

4

Implicit in your question are two assumptions. First, I assume that the line breaks may be indicated by either '\r\n', '\n' or '\r'. Second, you want to ignore empty lines in your result.

I think you can acheive both by first converting all the line breaks into a single form, then splitting while ignoring empty lines, like this:

contents.replace(/(\r\n)|\r|\n/g, '\n').split(/\n+/g)

The replace command should convert all the different line breaks to '\n', while the split will split the line wherever it sees 1 or more consecutive '\n's.

OldGeeksGuide
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2

This might not be an elegant solution but you can sanitise the strings by replacing any \r with \n and then trim off the last \n (which will give you an empty array that you do not need).

See example:

var a = "a\nb\rc\n\n\n\n",
    b = a.replace(/\r/g,"\n").replace(/[\n]+/g,"\n").replace(/\n$/,"").split("\n");

output of var a:

"a
 bc



 "

output of var b:

["a", "b", "c"]

The process of cleaning up is as follows:

  1. Take the string and replace all \r with \n, this will leave you with multiple \n in certain places
  2. Clean multiple instances of \n to singulars
  3. Remove any trailing \n to avoid an empty array element at the end
  4. Split to array on the \n
Chris Rymer
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