JavaScript：正则表达式找到最后的答案

Question

I have following text:

The simple question, “What do you want to be when you grow up?” used to be fun to answer when we were all young. An astronaut, a princess, a superhero, a wizard were all perfectly plausible career's to choose as a kindergartener. Once we get older that question becomes more of a serious matter and requires more thought and planning. It is no longer a subject that is fun to think about.
That simple question will no longer be satisfied with a random silly answer. What he or she chooses do with one's life is a difficult, major decision.

I want to select the word ' do ' proceeding by ' chooses '. For this I used following regex:
/(\\bchooses do)/
But it selects the word " chooses do ". How can I select only the word ' do ' preceding by chooses.

Answer 1

You can select only part of the matched phrase, for example: /chooses (do)/

This tool may help.

To actually replace the text, String.replace can take a callback which receives your regex matches as arguments, so you could do this:

text.replace( /chooses (do)/, function(match, group1) { 
    return 'chooses to ' + group1;
} );

Which would change 'Bob chooses do nothing' to 'Bob chooses to do nothing'.

Answer 2

If you want to replace the word do with something else, then use something more like this:

var newword = "go";
newtext = text.replace(/\bchooses do/g, "chooses " + newword);