You are viewing the version of this documentation from Perl blead. This is the main development branch of Perl. (git commit b3138094d90d9a1861f0e10af33500f7d508e29c)
ucfirst EXPR
ucfirst

Returns the value of EXPR with the first character in uppercase (Unicode calls this titlecase). If EXPR is omitted, ucfirst uses $_.

my $str = ucfirst("hello world!"); # "Hello world!"

This function behaves the same way under various pragmas, such as in a locale, as lc does.

Note: This is the internal function implementing the \u escape in double-quoted strings.

my $str = "\uperl\E is great"; # "Perl is great"