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2009-07-15T08:44:58.700
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You only need to use the <code>new RegExp()</code> part when creating dynamic regular expressions. You can use literals at other times. /\d+/ is the equivalent of <code>new RegExp("\\d+")</code>. Note that you have to escape special characters when using the latter. Also noteworthy is that <code>String#match</code> returns null or an array. This is not apparent based on the supplied solutions (<code>parseInt(name.match(/\d+/), 10)</code>). It just so happens that it is converted to a string when passed to <code>parseInt</code>. <a href="https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Functions/parseInt" rel="noreferrer">ParseInt</a> converts string values to integers (when possible). <pre><code>name.match(/\d+/)[0] /\d+/.exec(name)[0] </code></pre> Those two are functionally identical in this case. The other match you were referring to (the negative matching) requires a special flag. To duplicate the functionality of gsub you need to tell the regex to be applied more than once with the <code>g</code> flag. <pre><code>'users[107][teacher_type]'.replace(/users\[|\]\[teacher_type\]/g,'') </code></pre> Or if you had to use <code>new RegExp</code> for some reason you'd accomplish the same as above like so: 'users[107][teacher_type]'.replace(new RegExp('users\[|\]\[teacher_type\]', 'g'),'') Notice again how I had to escape all the backslashes. Mozilla's Developer Center is a good <a href="https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/RegExp" rel="noreferrer">reference</a> to familiarize yourself with regex in javascript.
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1. POHow to pull a number out of a string in JavaScript?
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1. POHow to pull a number out of a string in JavaScript?
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