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Posted by Jasen Betts on 02/10/06 22:30
On 2006-02-09, Jim Michaels <jmichae3@nospam.yahoo.com> wrote:
>
> "Palle Hansen" <palle@na.invalid> wrote in message
> news:43cf4b9b$0$84031$edfadb0f@dtext01.news.tele.dk...
>> yawnmoth wrote:
>>
>>> if (eregi("^[a-z0-9| |\,\-\+\.]+$",$string))
>>
>>> Why does $string = 'te\st' yield a match? The ereg expression doesn't
>>> have a \\ in it...
>>
>> To have this expression make sence to me, it should look like
>>
>> if (eregi("^[a-z0-9 ,+.-]+$",$string)){
>>
>> '-' should be the first og last character
>>
>> all the special characters looses their meaning in a character class.
>> so you acually have 4 maching backslashes in the expression
>
> nope. I just tried it. I've been able to escape things in RE char classes
> for a long time. otherwise, you couldn't include things like tabs \t,
> newline \n, return \r and other control characters,
those aren't escaped in the regular expression, they are escaped in the
string. The resular expression parser doesn't see the slashes associated
with those symbols, rather it sees the actual character.
> whitespace \s, word characters \w, decimal digits \d.
they don't work inside bracket expressions.
> We didn't get Perl's character classes
> like ::alpha:: (I don't think).
???
--
Bye.
Jasen
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