FindList

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FindList[file, text]

returns a list of all lines in file that contain text.

FindList[file, {$text_1$, $text_2$, ...}]

returns a list of all lines in file that contain any of the specified string.

FindList[{$file_1$, $file_2$, ...}, ...]

returns a list of all lines in any of the filei that contain the specified strings.

• • stream = FindList["ExampleData/EinsteinSzilLetter.txt", "uranium"];

• • Length[stream]

• • FindList["ExampleData/EinsteinSzilLetter.txt", "uranium", 1]