['<code>/p</code>', 'optionally preserve <code>${^MATCH}</code> variables (avoiding <code>$&</code> penalty until COW in v5.20)'],
['<code>/\v/, /\h/</code>', 'vertical and horizontal whitespace escapes (<code>\V</code> <code>\H</code> to invert); also <code>/\R/</code> for newlines'],
['<code>my $_</code>', 'lexically scoped version of the default variable', {experimental => 'lexical_topic', dropped => v5.23.4}],
['<code>/p</code>', 'optionally preserve <code>${^MATCH}</code> variables (avoiding <code>$&</code> penalty until COW in v5.20)'],
['<code>/\v/, /\h/</code>', 'vertical and horizontal whitespace escapes (<code>\V</code> <code>\H</code> to invert); also <code>/\R/</code> for newlines'],
['<code>my $_</code>', 'lexically scoped version of the default variable', {experimental => 'lexical_topic', dropped => v5.23.4}],