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7.2.48 The pos function
Description
The pos function accepts up to three of the parameters described below (the
last parameter is optional), searches for one string in another string, and returns the
position of the first string in the second string, or zero if the first string was not found
in the second string.
Parameter
- The first parameter needle is an
expression of
string type or char type,
and is the string to search for.
- The second parameter haystack is an
expression of
string type or char type,
and is the string to be searched.
- The third parameter start is an
expression of
integral type, and specifies the position in
haystack to begin searching for needle. If start is
omitted then haystack is searched starting from position one. If
start is greater than the length of haystack then zero is returned.
Example
pos('o', 'Hello world') returns 5
pos('o', 'Hello world', 1) returns 5
pos('o', 'Hello world', 6) returns 8
pos('o', 'Hello world', 9) returns 0
Portability
Operating Systems: All
Standard Pascal: No
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