need help in understanding javascript code

Question

Can anyone explain me the following piece of code

sampleQuery.replace(new RegExp("("+query+")","ig")

What is this "ig" stands for?

immutabl · Accepted Answer · 2011-05-25 11:42:24Z

5

the i and the g are flags used with Regular Expressions:

g - 'global' matching - ie. gets all matches (the default behaviour is to stop after one match is found. http://www.w3schools.com/jsref/jsref_regexp_g.asp

i - makes the matches case-insensitive. http://www.w3schools.com/jsref/jsref_regexp_i.asp

hth.

edited May 25, 2011 at 11:42

answered May 25, 2011 at 11:18

immutabl

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6 Comments

Marcel Korpel Over a year ago

Please don't refer to W3Schools: see W3Fools why. Use MDC's RegExp instead.

Michael J.V. Over a year ago

I'm agreeing with Marcel, W3Schools shouldn't be used as any kind of reference seeing they got outdated and terribly wrong information up there.

immutabl Over a year ago

I don't see anything wrong with using it for quick n dirty answers such as this for novices - in my experience newbies find the interactive JS tool very useful.

Felix Kling Over a year ago

I would avoid the term greedy here as it normally refers to some other behaviour in the context of regular expressions (.* vs .*?).

Marcel Korpel Over a year ago

Ah, I see, but at least it explains what's wrong with W3Schools. And as you say: those answers become quick and dirty: those newbies will come back soon when they bluntly copy-pasted such an advice on W3Schools containing lots of security holes and illogical advice.

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