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<li><strong>Argument <codeclass="python hljs"><spanclass="hljs-string">'flags=re.IGNORECASE'</span></code> can be used with all functions.</strong></li>
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<li><strong>Argument <codeclass="python hljs"><spanclass="hljs-string">'flags=re.MULTILINE'</span></code> makes <codeclass="python hljs"><spanclass="hljs-string">'^'</span></code> and <codeclass="python hljs"><spanclass="hljs-string">'$'</span></code> match the start/end of each line.</strong></li>
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<li><strong>Argument <codeclass="python hljs"><spanclass="hljs-string">'flags=re.DOTALL'</span></code> makes dot also accept newline.</strong></li>
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<li><strong>Use <codeclass="python hljs"><spanclass="hljs-string">r'\1'</span></code> or <codeclass="python hljs"><spanclass="hljs-string">'\\1'</span></code> for backreference.</strong></li>
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<li><strong>Use <codeclass="python hljs"><spanclass="hljs-string">'?'</span></code> to make an operator non-greedy.</strong></li>
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