Paolo Bonzini wrote:
I also think it would be more useful if =~ returned MatchResult/nil
instead of true/false.
There's #searchRegex: for that. The "=~" name seemed more like a
boolean query to me.
There's #matchRegex: '.*whatever.*' for that :)
I just don't think that what it does is sufficiently useful to devote
the =~ operator to it.
Both Perl and Ruby return values that can be interpreted as true/false
from =~, but both of them also capture the matched expression and
sub-expressions into variables. We don't have that possibility, so I
think =~ should work harder.
Here is a new version of the patch (only the regex.st parts) that
supports cute things like
st> ^'abc' copyFrom: 1 to: 3 replacingRegex: 'a(.)c' with: 'X%1Z'!
'XbZ'
That is nice. I did wonder whether backslashes would be better, but
eventually decided that I could live with percents.
BTW there is a missing period in #copyFrom:to:replacingAllRegex:with:.
Mike
--- smalltalk-2.1g-regex/examples/regex.st 2005-05-30 17:05:02.399926760 +0000
+++ smalltalk-2.1g-mod/examples/regex.st 2005-05-30 23:33:38.161392248 +0000
@@ -436,19 +436,21 @@
regex := pattern asRegex.
res := WriteStream on: (String new: to - from + 1).
idx := from.
- [
- regs := self searchRegex: regex from: idx to: to.
- beg >= 1
- regs notNil
- ] whileTrue: [
- beg := regs from.
- end := regs to.
- res next: beg - idx putAll: self startingAt: idx.
- res nextPutAll: (str bindWithArguments: regs).
- idx := end + 1.
- beg > end ifTrue: [ res nextPut: (self at: idx). idx := idx + 1 ].
- idx > self size ifTrue: [ ^res contents ].
- ].
+ [ regs := self searchRegex: regex from: idx to: to.
+ beg >= 1.
+ regs notNil ]
+ whileTrue:
+ [ beg := regs from.
+ end := regs to.
+ res next: beg - idx putAll: self startingAt: idx.
+ res nextPutAll: (str bindWithArguments: regs).
+ idx := end + 1.
+ beg > end
+ ifTrue:
+ [ res nextPut: (self at: idx).
+ idx := idx + 1 ].
+ idx > self size
+ ifTrue: [ ^res contents ]. ].
res next: to - idx + 1 putAll: self startingAt: idx.
^res contents
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