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    <p>You want to use <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/match">String.match</a> instead of String.replace. You'll also want your regex to match multiple strings in parentheses, so you can't have ^ (start of string) and $ (end of string). And we can't be greedy when matching inside the parentheses, so we'll use .*?</p> <p>Stepping through the changes, we get:</p> <pre><code>// Use Match "Cu(NO3)2(CO2)3".match(/^.*\((.*\)).*$/); ["Cu(NO3)2(CO2)3", "CO2)"] // Lets stop including the ) in our match "Cu(NO3)2(CO2)3".match(/^.*\((.*)\).*$/); ["Cu(NO3)2(CO2)3", "CO2"] // Instead of matching the entire string, lets search for just what we want "Cu(NO3)2(CO2)3".match(/\((.*)\)/); ["(NO3)2(CO2)", "NO3)2(CO2"] // Oops, we're being a bit too greedy, and capturing everything in a single match "Cu(NO3)2(CO2)3".match(/\((.*?)\)/); ["(NO3)", "NO3"] // Looks like we're only searching for a single result. Lets add the Global flag "Cu(NO3)2(CO2)3".match(/\((.*?)\)/g); ["(NO3)", "(CO2)"] // Global captures the entire match, and ignore our capture groups, so lets remove them "Cu(NO3)2(CO2)3".match(/\(.*?\)/g); ["(NO3)", "(CO2)"] // Now to remove the parentheses. We can use Array.prototype.map for that! var elements = "Cu(NO3)2(CO2)3".match(/\(.*?\)/g); elements = elements.map(function(match) { return match.slice(1, -1); }) ["NO3", "CO2"] // And if you want the closing parenthesis as Fabrício Matté mentioned var elements = "Cu(NO3)2(CO2)3".match(/\(.*?\)/g); elements = elements.map(function(match) { return match.substr(1); }) ["NO3)", "CO2)"] </code></pre>
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    1. POJavascript - Regex finding multiple parentheses matches
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    1. CObeated to the clock. +1 for pointing out match instead of replace and the global modifier
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      1. USJuan Guerrero
    2. COFrom the question, I believe the closing `)` is expected to be in the returned strings. Also, I'd prefer `match.slice(1, -1)` for removing both starting and closing parentheses instead of putting unnecessary regexes into it.
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      1. USFabrício Matté
    3. COGood call on slice! I'll update the code to use that instead. I'm not sure why Rygh2014 would want the ), but between your code and mine, that should be a fairly visible change.
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