About regex syntax

@newflexgetman wrote:

Hi,
According to this article, https://flexget.com/Plugins/regexp_parse, there is a syntax writing (?<=. What is this? I know ? its meaning on regex. But, in here, what is it? In line 8 and 11, there are same symbol ?= inside. Wish some help.

1 regexp_parse:
  2 source: http://username:password@ezrss.it/feed/
  3 sections:
    4 - {regexp: "(?<=<item>).*?(?=</item>)", flags: "DOTALL,IGNORECASE"}

  5 keys:
    6 title:
      7 regexps:
        8 - {regexp: '(?<=<title><!\[CDATA\[).*?(?=\](/).*?(?=\)\]></title>)'} #comment
    9 url:
      10 regexps:
        11 - {regexp: "magnet:.*?(?=])"}
    12 custom_field:
      13 regexps:
        14 - {regexp: "custom regexps", flags: "comma seperated list of flags (see python regex docs)"}
      15 required: False
    16 custom_field2:
      17 regexps:
        18 - {regexp: 'first custom regexps'}
        19 - {regexp: 'can't find first regexp so try this one'}

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