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what does /"/g mean as a string in javascript?

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I came across this on a webpage. value=value.replace(/"/g,'\\"'); I know the second part means \" but what does the first part mean? thx

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It's a regular expression.

I think that the " is supposed to be escaped, however. It might work anyway, though.

Basically, it's saying replace all " in a string with \"

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