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perlop: clarify \U, \L, \F behaviour #19999

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perlop: clarify \U, \L, \F behaviour #19999

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ddb18e9
perlop: clarify \U, \L, \F behaviour
mfontani Jul 27, 2022
7f00929
t/op/lc.t: add \L..\U tests
mfontani Jul 28, 2022
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6 changes: 3 additions & 3 deletions pod/perlop.pod
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Original file line number Diff line number Diff line change
Expand Up @@ -1790,9 +1790,9 @@ X<\l> X<\u> X<\L> X<\U> X<\E> X<\Q> X<\F>

\l lowercase next character only
\u titlecase (not uppercase!) next character only
\L lowercase all characters till \E or end of string
\U uppercase all characters till \E or end of string
\F foldcase all characters till \E or end of string
\L lowercase all characters till \U, \F, \E or end of string
\U uppercase all characters till \L, \F, \E or end of string
\F foldcase all characters till \U, \L, \E or end of string
\Q quote (disable) pattern metacharacters till \E or
end of string
\E end either case modification or quoted section
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5 changes: 4 additions & 1 deletion t/op/lc.t
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Expand Up @@ -17,7 +17,7 @@ BEGIN {

use feature qw( fc );

plan tests => 139 + 2 * (5 * 256) + 17;
plan tests => 139 + 2 + 2 * (5 * 256) + 17;

is(lc(undef), "", "lc(undef) is ''");
is(lcfirst(undef), "", "lcfirst(undef) is ''");
Expand Down Expand Up @@ -72,6 +72,9 @@ is(uc($b) , "HELLO\.\* WORLD", 'uc');
is(lc($b) , "hello\.\* world", 'lc');
is(fc($b) , "hello\.\* world", 'fc');

is("\L$a\U$b", 'hello.* worldHELLO.* WORLD', '\L$a\U$b');
is("\U$a\L$b", 'HELLO.* WORLDhello.* world', '\U$a\L$b');

# \x{100} is LATIN CAPITAL LETTER A WITH MACRON; its bijective lowercase is
# \x{101}, LATIN SMALL LETTER A WITH MACRON.
# Which is also its foldcase.
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