View source for Template:Template usage

<!-- Curly brackets matching should ignore [^}], \{{!}}; insource:/\{} is OK.
--><onlyinclude><!--
Make a search link.
-->{{plain link
  |url = 
    {{fullurl:Special:Search|search=<!--
        -->{{urlencode:<!-- encodes spaces, so let's avoid unnecessary spaces.

          Build this query:
          hastemplate: template insource:/\{\{ *[Tt]emplate *\| *[^}]*pattern/

          Add the ever present "hastemplate:" filter and a space
          -->hastemplate:"{{{template|{{{1|Template usage}}}}}}" <!-- 

          Add the "insource:/\{\{ *"
          -->insource:/\{\{ *<!--

          Add the "[Tt]".
          Save from an expensive, /regexp/i.
          -->[{{#invoke:String|sub<!-- saw first [ of a "[Tt]"  -->
          |{{uc:{{{template|{{{1|Template usage}}}}}}}}|1|1}}{{#invoke:String|sub
          |{{lc:{{{template|{{{1|Template usage}}}}}}}}|1|1}}]{{#invoke:String|sub 
          <!--                                               ^
                                                     You saw ]. 

          Add "emplate", the rest of the template name, starting from char 2.-->
          |{{{template|{{{1|Template usage}}}}}}|2}}<!-- 

          Add the tricky regexp part.
          --> *\{{!}}[^}]*<!-- optional space " *" around initial pipe 
          initial pipe is \|, i.e. \{{!}}
          Trickiest part: [character class] inverted with ^:  [^any char NOT }] 
          Zero or more (*) of those "non-curly brackets".
          All this stuff always matches, shows in bold in the search results

          Add the users regexp pattern part and closing /.
          -->{{{pattern|{{{2|''regexp''}}}}}}/<!--

          Add "prefix:" You see the space before it.
          --> prefix:<!--
          -->{{#switch:<!-- add namespace "numbers and letters" recognition -->
            {{{prefix|{{{3|}}}}}}
            |#default = {{{prefix|{{{3|{{FULLPAGENAME}}}}}}}}
            |n = {{NAMESPACE}}
            |0|: = :
            |1 = {{ns:1}}:
            |2 = {{ns:2}}:
            |3 = {{ns:3}}:
            |4 = {{ns:4}}:
            |5 = {{ns:5}}:
            |6 = {{ns:6}}:
            |7 = {{ns:7}}:
            |8 = {{ns:8}}:
            |9 = {{ns:9}}:
            |10 = {{ns:10}}:
            |11 = {{ns:11}}:
            |12 = {{ns:12}}:
            |13 = {{ns:13}}:
            |14 = {{ns:14}}:
            |15 = {{ns:15}}:
            |100 = {{ns:100}}:
            |101 = {{ns:101}}:
            |118 = {{ns:118}}:
            |119 = {{ns:119}}:
            |710 = {{ns:710}}:
            |711 = {{ns:711}}:
            |828 = {{ns:828}}:
            |829 = {{ns:829}}:
          }}
        }}<!-- End urlencode. -->
      }}<!-- End fullurl
    url done
    Now for name param of plainlinks.

  Appearance of link looks just like the query, unless labeled. 
  So we're rebuilding the query just for show this time. -->
  |name = <!-- for commentary see duplicate above -->
    {{#if: 
      {{{label|{{{4|}}}}}}
      |{{{label|{{{4}}}}}}
      |{{#if:
        {{{prefix|{{{3|}}}}}}

        |hastemplate:"{{{template|{{{1|Template usage}}}}}}" <!--
        -->insource:/\{\{ *<!--
        -->&#91;{{#invoke:String|sub<!-- saw first [ of a "[Tt]"  -->
          |{{uc:{{{template|{{{1|Template usage}}}}}}}}|1|1}}{{#invoke:String|sub
          |{{lc:{{{template|{{{1|Template usage}}}}}}}}|1|1}}&#93;{{#invoke:String|sub 
          |{{{template|{{{1|Template usage}}}}}}|2}}<!--     ^
        --> *\{{!}}&#91;^}&#93;*<!-- optional space " *" around initial pipe 
        -->{{#invoke:String|replace
          |{{#invoke:String|replace
            |{{{pattern|{{{2|''regexp''}}}}}}<!-- Given pattern
          -->|[|&#91;}}<!-- Replace any/all [ with HTML symbol
        -->|]|&#93;}}/<!-- replace any/all ] with there HTML symbol
        --> prefix:<!--
        -->{{#switch:<!-- add namespace "numbers and letters" recognition -->
          {{{prefix|{{{3|}}}}}}
          |#default = {{{prefix|{{{3|{{FULLPAGENAME}}}}}}}}
          |n = {{NAMESPACE}}
          |0|: = <nowiki />:
          |1 = {{ns:1}}:
          |2 = {{ns:2}}:
          |3 = {{ns:3}}:
          |4 = {{ns:4}}:
          |5 = {{ns:5}}:
          |6 = {{ns:6}}:
          |7 = {{ns:7}}:
          |8 = {{ns:8}}:
          |9 = {{ns:9}}:
          |10 = {{ns:10}}:
          |11 = {{ns:11}}:
          |12 = {{ns:12}}:
          |13 = {{ns:13}}:
          |14 = {{ns:14}}:
          |15 = {{ns:15}}:
          |100 = {{ns:100}}:
          |101 = {{ns:101}}:
          |118 = {{ns:118}}:
          |119 = {{ns:119}}:
          |710 = {{ns:710}}:
          |711 = {{ns:711}}:
          |828 = {{ns:828}}:
          |829 = {{ns:829}}:
        }}
      |{{#invoke:String|replace
          |{{#invoke:String|replace
            |'''Testing''' <kbd>{{{pattern|{{{2}}}}}}</kbd> '''on this page'''<!--
          -->|[|&#91;}}<!-- Replace any/all [ with HTML symbol
        -->|]|&#93;}}<!-- replace any/all ] with there HTML symbol-->
      }}
   }}
}}<!-- End of plainlinks
--></onlyinclude><noinclude>{{Documentation}}</noinclude>