SQL RegEx : Meta Characters

RegEx Meta characters are similar to Keywords in programming languages. They have special meaning in RegEx. Here is a list of meta characters-

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Meta Character Meaning Example
      . (dot) It is a placeholder which can be matched with any character RegEx :  Cat.

Matches: Any text start with “Cat” followed by any character like “CatX” “Cata” “Cat1″ Cat+” “CatC”

     [ Starts a Character Class
     ] Ends a Character Class
     – (hyphen) Range inside Character Class
     ^ 1. To define NOT in Character class

2. Boundary Meta character : To define begin of Line

     $ 1. Boundary Meta character : To define end of Line
     \ Escape character : If “\” follows any meta character, that meta character will be treated as simple character (not as Meta Char) To check is Source text contains a “$” or “?”.

RegEx : [\$\?]  : Escape both of these meta characters with “\”.

     * Quantifier : To match ZERO or MORE occurrences More details later
     + Quantifier : To match ONE or MORE occurrences More details later
     ? Quantifier : To match ZERO or ONE occurrence More details later
     ( Starts a Capturing groups More details later
     ) Ends a Capturing groups More details later
    { Quantifier More details later
     } Quantifier More details later
    | OR condition RegEx : (ABC|XYZ)

Matched : Text contains “ABC” or “XYZ”


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