Matchers

Matchers are in charge of extract software information. detectem has different matchers according to its target.

• Body Matcher
• DOM Matcher
• Header Matcher
• URL matcher
• XPath Matcher

Most matchers use an argument called extractor. Depending on its value, it could extract:

Presence

If extractor doesn’t have a named parameter or doesn’t exist, the matcher only checks plugin presence.

Version extraction

For these cases the extractor has version as the named parameter for the regular expression.

Name extraction

Some projects like AngularJS have modules that could be included to add functionality. The issue is that both core library and module have the same signature for the version, then it’s needed to determine the software module too.

For these cases extractor has name as the named parameter for the regular expression.