Mmm... dat multiple line werkt dus niet in sed, het moet trouwens ook niet met een hoofdletter M, en ik had het ook nog een beetje mis want het was juist de /s switch van 'single line' die relevant is....
Even bij Perl gekeken (omdat je dat makkelijk zou kunnen gebruiken vanaf de command line):
Perl allows us to choose between ignoring and paying attention to newlines by using the //s and //m modifiers. //s and //m stand for single line and multi-line and they determine whether a string is to be treated as one continuous string, or as a set of lines. The two modifiers affect two aspects of how the regexp is interpreted: 1) how the '.' character class is defined, and 2) where the anchors ^ and $ are able to match. Here are the four possible combinations:
no modifiers (//): Default behavior. '.' matches any character except "\n" . ^ matches only at the beginning of the string and $ matches only at the end or before a newline at the end.
s modifier (//s): Treat string as a single long line. '.' matches any character, even "\n" . ^ matches only at the beginning of the string and $ matches only at the end or before a newline at the end.
m modifier (//m): Treat string as a set of multiple lines. '.' matches any character except "\n" . ^ and $ are able to match at the start or end of any line within the string.
both s and m modifiers (//sm): Treat string as a single long line, but detect multiple lines. '.' matches any character, even "\n" . ^ and $ , however, are able to match at the start or end of any line within the string.
Here are examples of //s and //m in action:
$x = "There once was a girl\nWho programmed in Perl\n";
$x =~ /^Who/; # doesn't match, "Who" not at start of string
$x =~ /^Who/s; # doesn't match, "Who" not at start of string
$x =~ /^Who/m; # matches, "Who" at start of second line
$x =~ /^Who/sm; # matches, "Who" at start of second line
$x =~ /girl.Who/; # doesn't match, "." doesn't match "\n"
$x =~ /girl.Who/s; # matches, "." matches "\n"
$x =~ /girl.Who/m; # doesn't match, "." doesn't match "\n"
$x =~ /girl.Who/sm; # matches, "." matches "\n"
Most of the time, the default behavior is what is want, but //s and //m are occasionally very useful. If //m is being used, the start of the string can still be matched with \A and the end of string can still be matched with the anchors \Z (matches both the end and the newline before, like $ ), and \z (matches only the end):
$x =~ /^Who/m; # matches, "Who" at start of second line
$x =~ /\AWho/m; # doesn't match, "Who" is not at start of string
$x =~ /girl$/m; # matches, "girl" at end of first line
$x =~ /girl\Z/m; # doesn't match, "girl" is not at end of string
$x =~ /Perl\Z/m; # matches, "Perl" is at newline before end
$x =~ /Perl\z/m; # doesn't match, "Perl" is not at end of string
Ik probeerde dus dit:
cat file.tex | perl -C -pe 's/ontwricht(.*)is/<boe> \1 <\/boe>/gsm'
Maar dat werkt (hier) niet, de Perl regular expression leest ook niet over de newlines heen. Kan zijn dat het niet 't juiste newline teken is, of dat ik de functie niet op de juiste manier gebruik...
Moet nu even weg, misschien dat iemand anders nu op ideeën komt, anders kom ik er later nog op terug 
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