=over =item quotemeta EXPR X<quotemeta> X<metacharacter> =item quotemeta Returns the value of EXPR with all the ASCII non-"word" characters backslashed. (That is, all ASCII characters not matching ...

=over =item substr EXPR,OFFSET,LENGTH,REPLACEMENT X<substr> X<substring> X<mid> X<left> X<right> =item substr EXPR,OFFSET,LENGTH =item substr EXPR,OFFSET Extracts a substring out of EXPR and return...

=over =item fc EXPR X<fc> X<foldcase> X<casefold> X<fold-case> X<case-fold> =item fc Returns the casefolded version of EXPR. This is the internal function implementing the C<\F> escape in double-qu...

=over =item grep BLOCK LIST X<grep> =item grep EXPR,LIST This is similar in spirit to, but not the same as, L<grep(1)> and its relatives. In particular, it is not limited to using regular expressio...

=over =item cos EXPR X<cos> X<cosine> X<acos> X<arccosine> =item cos Returns the cosine of EXPR (expressed in radians). If EXPR is omitted, takes the cosine of L<C<$_>|perlvar/$_>. For the inverse ...

=over =item sqrt EXPR X<sqrt> X<root> X<square root> =item sqrt Return the positive square root of EXPR. If EXPR is omitted, uses L<C<$_>|perlvar/$_>. Works only for non-negative operands unless yo...

=over =item exp EXPR X<exp> X<exponential> X<antilog> X<antilogarithm> X<e> =item exp Returns I<e> (the natural logarithm base) to the power of EXPR. If EXPR is omitted, gives C<exp($_)>. =back

=over =item abs VALUE X<abs> X<absolute> =item abs Returns the absolute value of its argument. If VALUE is omitted, uses L<C<$_>|perlvar/$_>. =back

=over =item map BLOCK LIST X<map> =item map EXPR,LIST Evaluates the BLOCK or EXPR for each element of LIST (locally setting L<C<$_>|perlvar/$_> to each element) and composes a list of the results o...

=over =item seek FILEHANDLE,POSITION,WHENCE X<seek> X<fseek> X<filehandle, position> Sets FILEHANDLE's position, just like the L<fseek(3)> call of C C<stdio>. FILEHANDLE may be an expression whose ...