- str =~ <span class="hljs-regexp">/^(?:foo)$/</span>
- str =~ <span class="hljs-regexp">%r{foo|bar|buz$}</span>
- str =~ <span class="hljs-regexp">%r!foo|bar$!</span>
- str =~ <span class="hljs-regexp">%r[foo|bar$]</span>
- str =~ <span class="hljs-regexp">%r(\(foo|bar\)$)</span>
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