Match zero or one characters : Frequency « Regular Expression « Perl
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Perl
»
Regular Expression
»
Frequency
Match zero or one characters
$p =
"This is a pattern test."
;
if
(
$p =~ /
(
\w
)
?/
){
print
"$1\n"
;
}
Related examples in the same category
1.
Check the frequency
2.
To specify a maximum number of occurrences, use 0 as the lower bound.
3.
To specify a minimum number of occurrences, leave off the upper bound.
4.
Checking for multiple occurrences
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