Question

how could I remove all characters from a string that aren t a-z/A-Z and 0-9 and _ with PHP? I tried that but it has no effect, it returns the same string back:

preg_replace( [^a-zA-Z0-9_] ,   ,  Testdo123_-:=)§%& );

Answer 1

rel=“nofollow noreferer”>preg_ prefixed functions rel=nofollow noretinger” 定期表述

但是,你们却要放弃限制。或者,确切地说:PHP将[和>>作为划界人,仅将^a-zA-Z0-9_作为您的实际定期表述。

因此(使用<代码>/作为划界人):

preg_replace( /[^a-zA-Z0-9_]/ ,   ,  Testdo123_-:=)§%& )

Answer 2

各位似乎重新获得划界者:

preg_replace( /W+/ ,   ,  Testdo123_-:=)§%& );

。页: 1

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