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fix overzealous global replace

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Mark Pilgrim
2010-01-28 14:26:37 -05:00
parent 362f9d3f4c
commit 825254bdd6
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regular-expressions.html
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@@ -282,7 +282,7 @@ body{counter-reset:h1 5}
<p class=a>&#x2042;
<h2 id=phonenumbers>Case study: Parsing Phone Numbers</h2>
<aside>\d matches any numeric digit (0&ndash;10). \D matches anything but digits.</aside>
<aside>\d matches any numeric digit (0&ndash;9). \D matches anything but digits.</aside>
<p>So far you&#8217;ve concentrated on matching whole patterns. Either the pattern matches, or it doesn&#8217;t. But regular expressions are much more powerful than that. When a regular expression <em>does</em> match, you can pick out specific pieces of it. You can find out what matched where.
<p>This example came from another real-world problem I encountered, again from a previous day job. The problem: parsing an American phone number. The client wanted to be able to enter the number free-form (in a single field), but then wanted to store the area code, trunk, number, and optionally an extension separately in the company&#8217;s database. I scoured the Web and found many examples of regular expressions that purported to do this, but none of them were permissive enough.
<p>Here are the phone numbers I needed to be able to accept: