contains
Checks if this text contains the specified substring.
Note that for all texts t, t.contains('') is true, and for all texts u and v such that u == v, u.contains(v) is true.
t.contains(u) is equivalent to t.index_of(u) >= 0.
Return
true if this text contains the specified substring, false otherwise
Since
0.6.0
Parameters
text
the substring for which to search