On 7/15/10 Thu Jul 15, 2010 12:24 PM, "Chandan Kumar"
<chandan_28...@yahoo.com> scribbled:
> Hi guys,
>
> I could able to understand the quantifiers. But still stuck with one
> confusion.if dot operator is used with quantifiers.
>
> ex: my string is $_="thiiiis is my first regular expression";
>
> please explain the below questions with answer.
> 1)thi.*?
> 2)thi.+?
> 3)thi.+?s
> 4)thi.*?s
I suggest you use these constructs in a program, print out the results, and
see if you can deduce why they give the results they do. Here is some help:
% perl -e '$x=q(thiiiis is);$x=~m{thi(.*?)};print qq("$1"\n);'
""
% perl -e '$x=q(thiiiis is);$x=~m{thi(.+?)};print qq("$1"\n);'
"i"
% perl -e '$x=q(thiiiis is);$x=~m{thi(.*?)s};print qq("$1"\n);'
"iii"
% perl -e '$x=q(thiiiis is);$x=~m{thi(.+?)s};print qq("$1"\n);'
"iii"
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