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Per Amundsen, 08/13/2014 09:37 PM

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_Added in 1.9.4_
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*/filter [-asdfkwxnpriocteubglLz] [n-n2] [c s] <infile | dialog id> <outfile | dialog id | alias> [alias] <matchtext>*
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Scans lines of text in a window, file or dialog control, any matches are then written out to another window, file, or dialog control. 
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The order of the switch are important, they define what is the infile and what is the outfile, see the examples for more information. 
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You can filter blank lines by specifying [[$crlf]] for the matchtext.
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The [[$filtered]] identifier will retrieve the number of matches found.
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*Switches*
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-w - Indicates the parameter is a window.
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-f - Indicates the parameter is a file.
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-a - Sorts filtered lines by calling the optional [alias] parameter, the alias is passed two lines, $1 and $2, it must compare both and return -1, 0, or 1 to indicate relative sort order of these lines to each other.
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-x - Excludes matching lines.
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-n - Prefixes lines with a line number. (the Nth match)
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-d - TODO
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-s - Indicates the status window will be used.
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-p - TODO
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-r - Specifies the range of lines n to n2 for filtering.
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-b - Strips BURK codes when matching text.
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-g - Indicates the matchtext is a regular expression.
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-z - TODO
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-k - Indicates that you have specified an <alias> as the output instead of a window name. The alias will be called with the result of each filtered line with the form $<alias>($1) where $1 is the matched line.
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-i - Indicates that you have provided a [dialog id] custom dialog control as the input.
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-o - Indicates that you have provided a [dialog id] custom dialog control as the output.
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-c - Clears the output window/file before writing to it.
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-t - Sorts the output based on [c s], column C using character S as the columns separator.
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-e - Used with -t, specifies a descending sort.
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-u - Used with -t, specifies a numeric sort.
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-l - Filters from the side-listbox in the first window.
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-L - Filters to the side-listbox in the second window.
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*Parameters*
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[n-n2] - if -r is used, indicates the range of lines to be scanned*
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[c s] - if -t is used, indicates how to do the sort
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<infile | dialog id> - if no switch implies a window's name to be use as the infile, you must provide an infile (a window, a file, or a dialog control)
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<outfile | dialog id | alias> - if no switch implies a window's name to be used as the outfile, you must provide an outfile (a window, a file, a dialog control, or an alias name if -k is used)
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[alias] - optional alias called if -a is used
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<matchtext> - the expression used for the search, if [[$null]] is used, it matches everything. 
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<pre>
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;Filter from the file "c:\my file.txt" to the custom window @mywin.
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/filter -fw "c:\my file.txt" @mywin *findthis*
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;Filter from the custom window @mywin to the file "c:\my file.txt".
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filter -wf @mywin "c:\my file.txt" *findthat*
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;Filter from the status window to the single message window.
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/filter -sd *findthis*
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;Filter from the single message window to the status window.
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/filter -ds *findthat*
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;Filter from the filename @this_is_a_file to the dialog 'dialog', id '1'.
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/filter -fo @this_is_a_file dialog 1 *findthis*
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;Filter from a file and call an alias for each line.
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/filter -fk file myalias *findthat*
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;Filter from a file to a file using regex.
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/filter -ffg file1 file2 /regex here/
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alias sortexample {
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  ;Create 2 windows.
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  /window @asd1
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  /window @asd2
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  ;Add some unordered lines.
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  aline @asd1 cccc3|cccc2|cccc1
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  aline @asd1 aaaa3|aaaa2|aaaa1
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  aline @asd1 bbbb3|bbbb2|bbbb1
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  ;Sort by column "1" where column separator is "|" (ascii char 124). (equal to $gettok(cccc3|cccc2|cccc1, 1, 124))
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  /filter -twwc 1 124 @asd1 @asd2
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}
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</pre>