Assuming a Perl script that allows users to specify several text filter expressions in a config file, is there a safe way to let them enter regular expressions as well, without the possibility of unintended side effects or code execution? Without actually parsing the regexes and checking them for problematic constructs, that is. There won't be any substitution, only matching.Assuming a Perl script that allows users to spe
阅读背景：
从文件中读取正则表达式是否安全？
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