howa wrote:
Hello,
Hello,
I have two strings:
1. abc
2. abc&
The line of string might end with "&" or not, so I use the expression:
(.*)[$&]
Why it didn't work out?
$ perl -le'
for ( "abc", "abc&" ) {
print;
print $1 if /(.*)[$&]/;
}
'
abc
Unmatched [ in regex; marked by <-- HERE in m/(.*)[ <-- HERE ]/ at -e
line 4.
It didn't work because the variable $& is interpolated so the regular
expression ends up as '(.*)[]', which is an invalid character class, or
$& contains some character that does not match your string.
What are you trying to match? If you want an optional '&' match at the
end of the string then perhaps you want:
$ perl -le'
for ( "abc", "abc&" ) {
print;
print $1 if /(.*)&?$/;
}
'
abc
abc
abc&
abc&
John
--
Perl isn't a toolbox, but a small machine shop where you
can special-order certain sorts of tools at low cost and
in short order. -- Larry Wall
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