search text key word from a sentence

I second Shubham's suggestion of a!isInText() being newer and more likely to be flexible.  I will just point out that the classic way of doing this would have been "search()", which is case insensitive, and "find()", which is case sensitive.  Either or both could be used for your particular use case - these both return not "true" or "false", but rather an index number of the position that the target text is found within the source text (or 0 if not found at all).

I second Shubham's suggestion of a!isInText() being newer and more likely to be flexible.  I will just point out that the classic way of doing this would have been "search()", which is case insensitive, and "find()", which is case sensitive.  Either or both could be used for your particular use case - these both return not "true" or "false", but rather an index number of the position that the target text is found within the source text (or 0 if not found at all).