[MacPorts] #58161: Guide does not explain that selectors use regular expressions

[MacPorts]

#58161: Guide does not explain that selectors use regular expressions
---------------------------+--------------------
  Reporter:  chrstphrchvz  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  guide         |    Version:  2.5.4
Resolution:                |   Keywords:
      Port:                |
---------------------------+--------------------

Comment (by ryandesign):

 When I want to find ports depending on another port ''portname'' what I
 usually use is:

 {{{
 port echo depends:':portname($|\s)'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/58161#comment:3>
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