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    <p>Try this:</p> <pre><code>sed -r $'s/(\$LD = )(\'.*\')(.*)/\\1_(\\2)\\3/' filename </code></pre> <p>Example:</p> <pre><code>$ echo "\$LD = 'Some String';" | sed -r $'s/(\$LD = )(\'.*\')(.*)/\\1_(\\2)\\3/' $LD = _('Some String'); </code></pre> <p><strong>Edit:</strong></p> <p>This will look for and change both variables, the <code>-i</code> will make the change in-place:</p> <pre><code>sed -i -r $'s/(\$(LD|Another) = )(\'.*\')(.*)/\\1_(\\3)\\4/' </code></pre> <p>You can list more variable names separated by pipe characters.</p> <p>Your <code>grep</code> command needs single quotes instead of backticks and a <code>-E</code> to use extended regexes. It also needs a filespec glob. The regex as you have basically says "Does this file have any variable definitions?" It says to look for any variable that:</p> <ul> <li>starts at the beginning of the line with no whitespace before it</li> <li>has zero or more array subscripts consisting of zero or more digits (which would include a null subscript, thus an array append)</li> <li>ignore any associative array assignments (<code>$array["key"]=value</code>)</li> <li>the line must end in a semicolon</li> <li>I'm not sure what the <code>?</code> is intended to do</li> </ul> <p>This fails if the variable assignment:</p> <ul> <li>occurs after some whitespace</li> <li>uses an alpha key or a variable as a key</li> <li>occurs on a line with other statements</li> <li>has any trailing whitespace</li> <li>possibly others</li> </ul> <p>You might need to make your regex more robust or simpler or just assume that any PHP file will have a variable assignment and let <code>sed</code> look for and change just the variables of interest.</p> <p>In order for your <code>grep</code> to have files to process, you need to specify which files to look at:</p> <pre><code>grep -E -i -R 'your regex' * | sed ... </code></pre> <p>Or, if you let <code>sed</code> do it:</p> <pre><code>find . -name "*.php" | sed ... </code></pre> <p>Also, a tool called <a href="http://betterthangrep.com/" rel="nofollow noreferrer"><code>ack</code> is better than <code>grep</code></a> for finding stuff in code files.</p> <p>In any case, especially if you use the in-place option, <em>I strongly recommend test runs (and backups).</em></p>
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    1. USDennis Williamson
    1. USDennis Williamson
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    1. COso for looking in multiple files and doing a replace i'd need something like : grep -i -R `^\$\w+\s*(\[[0-9]*\])*\s*=\s*.*?;$` | sed -r $'s/(\$LD = )(\'.*\')(.*)/\\1_(\\2)\\3/'
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      1. USGjergj Sheldija
 

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