PHP string replace modifiers -

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I'm trying to write a function instead of some string, and instead of asking how to change something, I I want to know more about modifier so I can do it myself

Take it for example: 

  preg_replace ('~ [\ w \ s] ~ ~ , '', $ Input);   
 or  
  string (preg_replace ('! ^ ^ A-Z] +!', '', $ S);   
 What are those people called? (~ [\ W \ s] ~) (! [A-Z] +!) They have little understanding to read or create a new one. Where can I find them all? Or learn to write them?   
 
 
 They are called regular expressions, 'a regular expression (reggae or red xp short) is a search pattern There is a special text string to describe. You can think of regular manifestations in the form of wildcards on steroids. ' 
 There is a reference and a playground to work with them here.

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