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Mathematica > File Operations >

Built-in Mathematica Symbol

FindList

FindList["file", "text"]
gives a list of lines in the file that contain the specified string.

FindList["file", {"text₁", "text₂", ...}]
gives a list of all lines that contain any of the specified strings.

FindList[{"file₁", ...}, ...]
gives a list of lines containing the specified strings in any of the file_i.

FindList[files, text, n]
includes only the first n lines found.

FindList returns {} if it fails to find any record which contains the specified text.

AnchoredSearch	False	whether to require that the text searched for be at the beginning of a record
IgnoreCase	False	whether to treat lowercase and uppercase as equivalent
RecordSeparators	{"\r\n", "\n","\r"}	separators for records
WordSearch	False	whether to require that the text searched for appear as a word
WordSeparators	{" ","\t"}	separators for words

The first argument to FindList can be InputStream["name", n], or simply "name" if there is only one open input stream with the specified name.

Get a list of lines in a file that contains "electors":

The first 2 lines that contain "electors":