Databases
StackOverflow2013
Postsdbo
POHow to operate on part of line only
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow to operate on part of line only
    primarykey
    data
    text
    <p>How do I make sed operate on specific parts of a line only? And, on the contrary, how do I make sed not work on specific parts of a line?</p> <p>Examples:</p> <pre><code>"A a A a ( A a ) A ( a A ) a" </code></pre> <p>How do I, for instance, replace all the <code>A</code>s with <code>T</code>s <em>only</em> between the <code>(</code> and <code>)</code> to obtain:</p> <pre><code>"A a A a ( T a ) A ( a T ) a" </code></pre> <p>And given next example input:</p> <pre><code>"F f F f ( F f ) F ( f F ) f" </code></pre> <p>How do I, for instance, replace all the <code>F</code>s with <code>X</code>s but <em>not</em> between the <code>(</code> and <code>)</code> to obtain:</p> <blockquote> <p>"X f X f ( F f ) X ( f F ) f"</p> </blockquote> <p>I searched Google but found nothing usable. I guess it's a general question about sed. The problem is reducible to general sed "templates", I hope.</p> <ol> <li>having FROM and TO then operate between them only (on all occurrences on given line)</li> <li>having FROM and TO operate anywhere else than between them...</li> <li>special case when FROM and TO are the same (between " and " or "FOO" and "FOO" etc.) for both 1. and 2.</li> </ol> <p>It should work with any operation, not just substitution, but also with printing etc., like printing everything between strings "FOO" and "BAR" in string.</p> <pre><code>"1 2 3 BAR a b c FOO d e f BAR g a h FOO i j k BAR l m n FOO o p q" </code></pre> <p>The result will be</p> <pre><code>" d e f i j k " </code></pre> <p>So, general examples on how to do it would be highly appreciated. It also seems that this question is quite common, but no good howto is found on the Google yet. I also guess this would be quite challenging to answer. Please, also do no give any hints on how to do it using Perl, AWK or whatever else than sed. This question is really a sed-only question.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USmjf
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow to operate on part of line only
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POHow to operate on part of line only
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POHow to operate on part of line only
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI tried my best. My idea was to split the line into pieces by the FROM and TO (somehow) and then "somehow" (I do not know how yet) to operate either on even or odd parts only or something alike. If I knew how to do it, I would not asked here. And, it's very likely my idea of splitting may be wrong. It's quite difficult and I used to use sed for simple tasks only before.
      singulars
      1. POHow to operate on part of line only
      1. USmjf
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload