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    <p>This might work for you:</p> <pre><code># create multiline test data cat &lt;&lt;\! &gt;/tmp/a &gt; this &gt; this { this needs &gt; changing to &gt; that } that &gt; that &gt; ! sed '/{/!b;:a;/}/!{$q;N;ba};h;s/[^{]*{//;s/}.*//;s/this\|that/\U&amp;/g;x;G;s/{[^}]*}\([^\n]*\)\n\(.*\)/{\2}\1/' /tmp/a this this { THIS needs changing to THAT } that that # convert multiline test data to a single line tr '\n' ' ' &lt;/tmp/a &gt;/tmp/b sed '/{/!b;:a;/}/!{$q;N;ba};h;s/[^{]*{//;s/}.*//;s/this\|that/\U&amp;/g;x;G;s/{[^}]*}\([^\n]*\)\n\(.*\)/{\2}\1/' /tmp/b this this { THIS needs changing to THAT } that that </code></pre> <p>Explanation:</p> <ul> <li>Read the data into the pattern space (PS). <code>/{/!b;:a;/}/!{$q;N;ba}</code></li> <li>Copy the data into the hold space (HS). <code>h</code></li> <li>Strip non-data from front and back of string. <code>s/[^{]*{//;s/}.*//</code></li> <li>Convert data e.g. <code>s/this\|that/\U&amp;/g</code></li> <li>Swap to HS and append converted data. <code>x;G</code></li> <li>Replace old data with converted data.<code>s/{[^}]*}\([^\n]*\)\n\(.*\)/{\2}\1/</code></li> </ul> <p>EDIT:</p> <p>A more complicated answer which I think caters for more than one block per line.</p> <pre><code># slurp file into pattern space (PS) :a $! { N ba } # check for presence of \v if so quit with exit value 1 /\v/q1 # replace original newlines with \v's y/\n/\v/ # append a newline to PS as a delimiter G # copy PS to hold space (HS) h # starting from right to left delete everything but blocks :b s/\(.*\)\({.*}\).*\n/\1\n\2/ tb # delete any non-block details form the start of the file s/.*\n// # PS contains only block details # do any block processing here e.g. uppercase this and that s/th\(is\|at\)/\U&amp;/g # append ps to hs H # swap to HS x # replace each original block with its processed one from right to left :c s/\(.*\){.*}\(.*\)\n\n\(.*\)\({.*}\)/\1\n\n\4\2\3/ tc # delete newlines s/\n//g # restore original newlines y/\v/\n/ # done! </code></pre> <p>N.B. This uses GNU specific options but could be tweaked to work with generic sed's.</p>
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    1. POsed recipe: how to do stuff between two patterns that can be either on one line or on two lines?
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    1. USpotong
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    1. POsed recipe: how to do stuff between two patterns that can be either on one line or on two lines?
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    1. CONice approach, but it seems to have a problem, e.g. with this input: `this \n this that \n this {this is OK} that {this \n must be changed to that \n and that} and that \n {and that \n } \n '`
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      1. USLev Levitsky
    2. CONamely, I think it doesn't cope with more than one block per line.
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    3. CO@LevLevitsky see below EDIT
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