Richard Lee wrote:
Thanks John for detailed explanation!!
I just dont' understand why \ (also didn't know that within [ ], \ has
to be escaped.) needs to be watch out for within " " ..
\ use can be tricky, for example:
$ perl -le"print 'hello'"
hello
$ perl -le"print 'he\llo'"
he\llo
$ perl -le"print 'he\\llo'"
he\llo
$ perl -le"print 'hello\'"
Can't find string terminator "'" anywhere before EOF at -e line 1.
$ perl -le"print 'hello\\'"
Can't find string terminator "'" anywhere before EOF at -e line 1.
$ perl -le"print 'hello\\\'"
hello\
$ perl -le"print 'hel'lo'"
Bad name after lo' at -e line 1.
$ perl -le"print 'hel\'lo'"
hel'lo
And that is in a single quoted string where there is no interpolation.
Read the "Gory details of parsing quoted constructs" section of perlop.pod:
perldoc perlop
John
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