需要有关正则表达式和JavaScript的帮助

Question

I've following problem: I use a clone script to clone input fields which are used for cms options. Depending on the field name the option arrays are created in the db.

I have following field at the moment:

options[categories][1][3]

and want to increase the first number by using a counter variable like:

options[categories][2][3]

options[categories][3][3]

...

However I'm not familiar with regular expressions so I hoped someone could provide a str.replace code which helps me to replace the first number with my counter variable.

Thanks in advance!

....... Code: .......

At the moment it looks like:

if ( $(clone).attr('name') ){
                newid = $(clone).attr('name');
                var position = newid.lastIndexOf("[");

                newid = newid.substring(0, position)+ '[' + (counter +1) + ']';
                $(clone).attr('name', newid);
            };      

Html field:

<input type="checkbox" value="1" name="options[categories][1][3]">

3 is the category id, 1 is the option I need the category for. The clone script would produce:

<input type="checkbox" value="1" name="options[categories][1][4]"> 

at the moment - but I need:

<input type="checkbox" value="1" name="options[categories][2][3]">

I think it's a regex problem because the easiest solution would be to search for [categories][anyvalue] and replace it with [categories][counter]

Answer 1

You could use a regular expression to replace the first number in brackets. Like this:

if ( $(clone).attr('name') ) {
    var newid = $(clone).attr('name');
    newid = newid.replace(/\[[0-9]*\]/, '[' + (counter + 1) + ']');
    $(clone).attr('name', newid);
};