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StringContainsQ

Tests whether a substring occurs in a string.

$ wo 'StringContainsQ["Hello world", "world"]'
True

$ wo 'StringContainsQ["Hello world", "planet"]'
False

The one-argument operator form applies to a string later, e.g. inside Select.

$ wo 'Select[{"CAC1", "CTG1", "ACT1", "CGA1", "CTC1"}, StringContainsQ["G"]]'
{CTG1, CGA1}