Differences between current version and predecessor to the previous major change of perlre(1).
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| Newer page: | version 2 | Last edited on Tuesday, June 4, 2002 12:22:38 am | by perry | |
| Older page: | version 1 | Last edited on Tuesday, June 4, 2002 12:22:38 am | by perry | Revert |
@@ -225,24 +225,24 @@
backslash character classes (if available), will
hold:
- alpha IsAlpha
-alnum IsAlnum
+ alpha !
IsAlpha
+alnum !
IsAlnum
ascii IsASCII
-blank IsSpace
-cntrl IsCntrl
-digit IsDigit d
-graph IsGraph
-lower IsLower
-print IsPrint
-punct IsPunct
-space IsSpace
-IsSpacePerl s
-upper IsUpper
-word IsWord
+blank !
IsSpace
+cntrl !
IsCntrl
+digit !
IsDigit d
+graph !
IsGraph
+lower !
IsLower
+print !
IsPrint
+punct !
IsPunct
+space !
IsSpace
+!
IsSpacePerl s
+upper !
IsUpper
+word !
IsWord
xdigit IsXDigit
-For example [[:lower:] and p{IsLower} are equivalent.
+For example [[:lower:] and p{!
IsLower} are equivalent.
If the utf8 pragma is not used but the
locale pragma is, the classes correlate with the
@@ -298,11 +298,11 @@
example:
POSIX trad. Perl utf8 Perl
- [[:^digit:] D P{IsDigit}
-[[:^space:] S P{IsSpace}
-[[:^word:] W P{IsWord}
+ [[:^digit:] D P{!
IsDigit}
+[[:^space:] S P{!
IsSpace}
+[[:^word:] W P{!
IsWord}
The POSIX character classes [[.cc.] and [[=cc=] are recognized but __not__ supported and trying to use them will cause an error.
Perl defines the following zero-width
@@ -1006,9 +1006,9 @@
like:
$pattern =~ s/(W)/\1/g;
-This is grandfathered for the RHS of a substitute to avoid shocking the __sed__ addicts, but it's a dirty habit to get into. That's because in PerlThink, the righthand side of a s/// is a double-quoted string. 1 in the usual double-quoted string means a control-A. The customary Unix meaning of 1 is kludged in for s///. However, if you get into the habit of doing that, you get yourself into trouble if you then add an /e modifier.
+This is grandfathered for the RHS of a substitute to avoid shocking the __sed__ addicts, but it's a dirty habit to get into. That's because in !
PerlThink, the righthand side of a s/// is a double-quoted string. 1 in the usual double-quoted string means a control-A. The customary Unix meaning of 1 is kludged in for s///. However, if you get into the habit of doing that, you get yourself into trouble if you then add an /e modifier.
s/(d+)/ 1 + 1 /eg; # causes warning under -w
Or if you try to do
