[SOLVED] Quick Explanation

[WorldDrknss]

I am fairly new to regex and need some help deciphering the following:

eregi("<[^>]*script*\"?[^>]*>", $check_url)

 

If I am correct this will check the url for:

find a: <

find any string containing zero or more: > at the beginning of the line

find any string containing zero or more: script

find any string containing zero or one: "

find any string containing zero or more: > at the beginning of the line

find a: >

 

[effigy]

The regular expression:

(?-imsx:<[^>]*script*"?[^>]*>)

matches as follows:
  
NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
  <                        '<'
----------------------------------------------------------------------
  [^>]*                    any character except: '>' (0 or more times
                           (matching the most amount possible))
----------------------------------------------------------------------
  scrip                    'scrip'
----------------------------------------------------------------------
  t*                       't' (0 or more times (matching the most
                           amount possible))
----------------------------------------------------------------------
  "?                       '"' (optional (matching the most amount
                           possible))
----------------------------------------------------------------------
  [^>]*                    any character except: '>' (0 or more times
                           (matching the most amount possible))
----------------------------------------------------------------------
  >                        '>'
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------

[WorldDrknss]

So ^ only indicates at the beginning of the line if it is first within the regex and is used as a wild character within brackets.

[effigy]

Metacharacters differ inside and outside of a character class. ^ as the first character in a character class negates the class; it's a literal anywhere else in the class or outside of it.

[WorldDrknss]

Ok, thanks for your help.

[effigy]

Slight correction: Outside of a character class the caret is a BOL (beginning of line) anchor unless it is escaped.