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/Perl 5.26

lcfirst

lcfirst EXPR

lcfirst

Returns the value of EXPR with the first character lowercased. This is the internal function implementing the \l escape in double-quoted strings.

If EXPR is omitted, uses $_ .

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

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https://perldoc.perl.org/5.26.0/functions/lcfirst.html