Note that what follows is pretty much a hack, but it might get you started. What it does is
1) grab everything from the line containing the string CITY to the line containing the string FLORIDA (I am assuming that FLORIDA is a header).
2) grabs the first word after CITY and opens it as a text file
3) writes all the lines grabbed as indicated above and prints them to the file.

#!/usr/bin/perl

use strict;
my ($file);

open(FILE, "<file.txt");
while(<FILE>) {
    chomp($_);
    if(/CITY/ ... /FLORIDA/) {
        if( ($file) = $_ =~ m/.+CITY:\s+(\w+)\s+/ ) {
           close(FH);
           $file .= '.txt';
           open(FH, ">>$file");
        }
        print FH "$_\n" unless $_ =~ m/FLORIDA/;
    }
}
close(FILE);

[download]
hope this helps,
davidj

In reply to Re: separating every set of textline by davidj
in thread separating every set of textline by jpavus

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