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3.3.3. Substrings
If L is a string and N is an integer, then L[N] is the N-th character
of L.

Example

L := 'hello world';
L[2];
e
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The operator 'IsIn' can be used to test if one string is a substring
of another.

Example

L := 'hello world';
'hello' IsIn L;     -- one may also write IsIn('hello',L)
TRUE
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See also: