Functions SEARCH and VERIFY

PL/1 offers three similar functions for looking in strings:

• INDEX, which resembles our EXAMINE ... FOR ... POSITION IN ....

• SEARCH, which returns the position of the first matching character of a given set in a target string

• VERIFY, which returns the position of the first character in a target string which is NOT part of a given set.

You can compare SEARCH with strstr().

VERIFY is more or less the opposite of SEARCH: it returns the position of the first foreign character.