'\w' == '[a-zA-Z0-9_]' # Also [ª²³…]. Matches an alphanumeric or _.
'\s' == '[ \t\n\r\f\v]' # Also [\x1c-\x1f…]. Matches a whitespace.
```
* **By default, decimal characters and alphanumerics from all alphabets are matched unless `'flags=re.ASCII'` is used. It restricts special sequence matches to the first 128 Unicode characters and also prevents `'\s'` from accepting `'\x1c'`, `'\x1d'`, `'\x1e'` and `'\x1f'` (the so-called information separators that divide text into files, tables, rows and fields).**
* **By default, decimal characters and alphanumerics from all alphabets are matched unless `'flags=re.ASCII'` is used. It restricts special sequence matches to the first 128 Unicode characters and also prevents `'\s'` from accepting `'\x1c'`, `'\x1d'`, `'\x1e'` and `'\x1f'` (non-printable characters that divide text into files, tables, rows and fields, respectively).**
* **Use a capital letter for negation (all non-ASCII characters will be matched when used in combination with ASCII flag).**
<li><strong>By default, decimal characters and alphanumerics from all alphabets are matched unless <codeclass="python hljs"><spanclass="hljs-string">'flags=re.ASCII'</span></code> is used. It restricts special sequence matches to the first 128 Unicode characters and also prevents <codeclass="python hljs"><spanclass="hljs-string">'\s'</span></code> from accepting <codeclass="python hljs"><spanclass="hljs-string">'\x1c'</span></code>, <codeclass="python hljs"><spanclass="hljs-string">'\x1d'</span></code>, <codeclass="python hljs"><spanclass="hljs-string">'\x1e'</span></code> and <codeclass="python hljs"><spanclass="hljs-string">'\x1f'</span></code> (the so-called information separators that divide text into files, tables, rows and fields).</strong></li>
<li><strong>By default, decimal characters and alphanumerics from all alphabets are matched unless <codeclass="python hljs"><spanclass="hljs-string">'flags=re.ASCII'</span></code> is used. It restricts special sequence matches to the first 128 Unicode characters and also prevents <codeclass="python hljs"><spanclass="hljs-string">'\s'</span></code> from accepting <codeclass="python hljs"><spanclass="hljs-string">'\x1c'</span></code>, <codeclass="python hljs"><spanclass="hljs-string">'\x1d'</span></code>, <codeclass="python hljs"><spanclass="hljs-string">'\x1e'</span></code> and <codeclass="python hljs"><spanclass="hljs-string">'\x1f'</span></code> (non-printable characters that divide text into files, tables, rows and fields, respectively).</strong></li>
<li><strong>Use a capital letter for negation (all non-ASCII characters will be matched when used in combination with ASCII flag).</strong></li>
</ul>
<div><h2id="format"><ahref="#format"name="format">#</a>Format</h2><pre><codeclass="python hljs"><str> = <spanclass="hljs-string">f'<spanclass="hljs-subst">{<el_1>}</span>, <spanclass="hljs-subst">{<el_2>}</span>'</span><spanclass="hljs-comment"># Curly brackets can also contain expressions.</span>