You may come across the situation where you have to check the conformity of a string according to a pattern.
- EXPR_STR : is a string or CLOB expression that contains the string to be tested.
- EXPR_PAT : is a string or CLOB expression that contains the pattern used for the verification.
As seen in the above screenshot pat keyword act as filter criteria, this will fetch only those records where BPCNAM contains ‘Beverly’ in it string. Pat keyword is similar to Like keyword of SQL.
Pat allows you to verify that a string corresponds to a pattern. A pattern is a set of characters including metacharacters.
Any character that is not a metacharacter must correspond to the character found in the string. The metacharacters are the following:
- * represents any number of characters (possibly no character).
- ? represents exactly one character.
- # represents a digit.
- ! represents a letter.
Hope this helps.
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