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    <p>The first problem is your regular expression. You have <code>[^-{]</code> that means that you are checking for a string that DOES NOT start with a <code>-</code> or a <code>{</code> but since <code>{left:</code> starts with a <code>{</code> the match is ignoring it. I imagine what you're trying to say is only replace the word <code>left</code>. To replace only part of a string you need to use back references like this:</p> <pre><code>$pattern = '/([-{]\b)(left)(\b)/'; $replace = '$1right$3'; $subject = 'body {left: 24px;} p {right: 24px;}'; $subject = preg_replace($pattern, $replace, $subject); // result: body {right: 24px;} p {right: 24px;} echo $subject; </code></pre> <p>Notice the parentheses in the <code>$pattern</code>. That is grouping those parts together. Also notice the <code>$n</code> in the <code>$replace</code>. The first parenthesis group <code>([-{]\b)</code> is <code>$1</code>, the second <code>(left)</code> is <code>$2</code>, and the third <code>(\b)</code> is <code>$3</code>.</p> <p>Now that solves replacing the left -> right but you can't do the array as suggested because this will happen:</p> <pre><code>body {left: 24px;} p {right: 24px;} Step 1: replace left pattern body {right: 24px;} p {right: 24px;} Step 2: replace right pattern body {left: 24px;} p {left: 24px;} </code></pre> <p>Oops! now you have all left's. That's not very helpful. What you really want is <code>preg_replace_callback</code>. <code>preg_replace_callback</code> will run a user defined function for each match. So what we do is we find all the lefts and rights in one go and then in our function we swap the left/right and return it plus the original string like so:</p> <pre><code>function replaceLeftRight($matches) { // get the opposite left/right $leftRight = ($matches[2] == 'left') ? 'right' : 'left'; return $matches[1] . $leftRight . $matches[3]; } $pattern = '/([-{]\b)(left|right)(\b)/'; $subject = 'body {left: 24px;} p {right: 24px;}'; $subject = preg_replace_callback($pattern, 'replaceLeftRight', $subject); // result: body {right: 24px;} p {left: 24px;} echo $subject; </code></pre>
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