Template:Category see also/Category pair check

{{pp-template|small=yes}}{{#ifeq: {{NAMESPACE}} | Category |{{#if: {{#invoke:String|match|{{BASEPAGENAME}}|%d+[snrt][tdh]%-century.+$|ignore_errors=true}}|{{#if: {{#invoke:String|match|{{{1|}}}|{{#invoke:String|match|{{BASEPAGENAME}}|-century.+$|ignore_errors=true}}|ignore_errors=true|plain=true}}|Category:Template Category see also used when Template Category pair probably should be}}}}}}

{{Documentation|content=

{{High-use}}

Check whether Template:Category see also has been used when Template:Category pair probably should be use.

The test is:

1. Is this page in the Category namespace?
2. Does this page's title end in "nn(st{{!}}nd{{!}}rd{{!}}th)-century something"
3. does the first linked cat's title end in the same "-century something" as the title of the page it is used on?

If the answer to all 3 is yes, then categorise the page in the hidden tracking category :Category:Template Category see also used when Template Category pair probably should be

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