[mod-security-users] who can help me explain FREE_TEXT_QUOTE_MACRO_EXPANSION ｉｎ easy-understand lan

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&nbsp; FREE_TEXT_QUOTE_MACRO_EXPANSION&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(([^%'])|([^\\][\\][%][{])|([^\\]([\\][\\])+[\\][%][{])|[^\\][\\][']|[^\\]([\\][\\])+[\\]['])+

[mod-security-users] who can help me explain FREE_TEXT_QUOTE_MACRO_EXPANSION ｉｎ easy-understand lan

[mod-security-users] who can help me explain FREE_TEXT_QUOTE_MACRO_EXPANSION ｉｎ easy-understand language ?