javascript

Figure 2–30. Passing a RegExp for a literal string to match() and search()
CHAPTER 2 ■ TYPE CONVERSION
Note, however, that, when JavaScript converts a string to a RegExp object, the g, i, and m flags, which
we’ll explore in Chapter 5, are not set. There’s no way for JavaScript to save the day if we intended to
pass /jack/ig but instead passed "jack" to match(), as Figure 2–31 displays:
var incredibles = "Mr. Incredible, Elastigirl, Violet, Dash, Jack-Jack";
incredibles.match(/jack/ig);
// ["Jack", "Jack"]
incredibles.match("jack");
// null
Note that match() conveys failure, which is to say no array of matching strings, by returning null.
Remember from Chapter 1 that null conveys no value on the heap, in other words, no object, array, or
function. That is why match() returned null instead of undefined.
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