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    <p>Try changing your regular expression into</p> <pre><code>/foo\s*{\s*bar:\s*([A-Za-z]*)\s*}/ </code></pre> <p>and then look at the output again. You will then probably see entries in your output with only the text you want to fetch.</p> <p>By using <code>(</code> and <code>)</code> you create a group within your regular expression, and the preg_match_all function will output the content only within those groups as well.</p> <h2>Output array</h2> <p>An example:</p> <pre><code>$text = 'Here comes a number: 5, here comes a number: 3 and here comes a number: 4'; preg_match_all( '/[Hh]ere comes a number: ([0-9])/', $text, $matches ); </code></pre> <p>After running this code, <code>$matches</code> will now be:</p> <pre><code>array( array( 'Here comes a number: 5', '5' ), array( 'Here comes a number: 5', '5' ), array( 'Here comes a number: 5', '5' ) ) </code></pre> <p>As you can see, <code>$matches</code> will contain an array for every string that matches. The first entry (<code>$matches[0]</code>) will always contain the complete matched string. The other indices (<code>$matches[1]</code>, <code>$matches[2]</code> and so on) will only contain the value of the specified groups in order. If you specify an optional group (for example <code>test([0-9])?</code>) the associated index will contain a <code>null</code> value.</p> <h2>Excluding groups from the output</h2> <p>Sometimes you want to specify a group but don't want to include it in the output array. For example:</p> <pre><code>$text = 'Here comes a number: 5, here comes another number: 3 and here comes a number: 4'; preg_match_all( '/[Hh]ere comes a(nother)? number: ([0-9])/', $text, $matches ); </code></pre> <p>I added a group for <code>nother</code> because I want it to be optional. Now my <code>$matches[1]</code> contains <code>"nother"</code> or <code>null</code>, and my <code>$matches[2]</code> contains the actual number. Since I'm not interested in whether the user chose to write <em>"another"</em> or <em>"a"</em>, I would like to exclude this group from the output.</p> <p>This can be done by starting the group with <code>(?:</code>. The resulting code:</p> <pre><code>$text = 'Here comes a number: 5, here comes a number: 3 and here comes a number: 4'; preg_match_all( '/[Hh]ere comes a(?:nother)? number: ([0-9])/', $text, $matches ); </code></pre> <p>The group <code>(?:nother)</code> gets ignored in the output, and <code>$matches[1]</code> references to the actual number we are interested in.</p>
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