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Showing content from https://webplatform.github.io/docs/javascript/RegExp/compile below:

compile · WebPlatform Docs

Compiles a regular expression into an internal format for faster execution.

rgExp.compile( pattern , [ flags ] )

rgExp

Required. An instance of a Regular Expression object. Can be a variable name or a literal.

pattern

Required. A string expression containing a regular expression pattern to be compiled

flags

Optional. Available flags, which may be combined, are: g (global search for all occurrences of the pattern), i (ignore case), m (multiline search), u (Unicode), y (sticky matching),

The following example illustrates the use of the compile method:

function CompileDemo(){
    var rs;
    var s = "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPp"
    
    var r = new RegExp("[A-Z]", "g");
    var a1 = s.match(r)              
    
 
    var a2 = s.match(r)
    return(a1 + "\n" + a2);
 }

The compile method converts pattern into an internal format for faster execution. This allows for more efficient use of regular expressions in loops, for example. A compiled regular expression speeds things up when reusing the same expression repeatedly. No advantage is gained, however, if the regular expression changes.

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