RegEx在JavaScript中拆分格式字符串

Question

I am using a JS date library which has a simple asString() formatting syntax eg dd mmm yyyy produces 01 Jan 1970 .

Unfortunately should the month happen to contain a letter that appears in the formatting string it can go wrong, eg `Date('2014-09-01').asString('dd mmm yyyy') = 01 Septe9ber 2014'

To solve this is quite simple; alter the asString() method to use the format '[dd] [mmm] [yyyy]' instead. However this comes from a global format string used by other methods. The only method that needs the square brackets is the asString method.

So my ideal solution is to simply add a function in that method which replaces any of the following strings within the format string:

formats=['yyyy','yy','mmmm','mmm','mm','m','dddd','ddd','dd','d','hh','min','ss'];

With itself surrounded by []

dd/mm/yyyy => [dd]/[mm]/[yyyy]

Unfortunately the RegEx is proving to be complex - simply looping through each item results in [[d][d]]/[[m][m]]/[[yy][yy]] .

So I'd like help writing this RegEx. If it can't be done please say so - I'm not interested in using new libraries as a solution but would consider solutions which solved the problem in a different way within the current asString method (ie no breaking changes)

Answer 1

This should do:

var regex = /(min|y+|m+|d+|h+|s+)/g,
    newString = format.replace(regex,'[$1]');

Tested with the format "dd/mm/yyyy" , resulted in "[dd]/[mm]/[yyyy]"