/(? A>) what does the php regular expression in/iU mean? Solution

/(?!. * A & gt;)/iU what does the php regular expression mean? /(?!. * A & gt;) what does the php regular expression in/iU mean ?, & Nbsp ;(?! Pattern) & nbsp; a negative pre-query that matches the search string at the beginning of any string that does not match & nbsp; pattern & nbsp. This is a non-get /(?!. * A>) what does the php regular expression in/iU mean?
/(?!. * A>) what does the php regular expression in/iU mean?
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(?! Pattern) negative pre-query: matches the search string at the beginning of any string that does not match pattern. This is a non-get match, that is, the match does not need to be obtained for future use.


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(?! Pattern) is a forward negative pre-query that matches the search string at the beginning of any string that does not match pattern. This is a non-get match, that is, the match does not need to be obtained for future use. For example, "Windows (?! 95
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98
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NT
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2000) "can match" Windows "in" Windows3.1 ", but cannot match" Windows "in" Windows2000 ". Pre-query does not consume characters. that is to say, after a match occurs, the next matching search starts immediately after the last match, instead of starting after the pre-query characters.

I (PCRE_CASELESS)
If this modifier is set, the expression is case-insensitive.

U (PCRE_UNGREEDY)
This modifier is used to flip the number of "greediness" so that greedy is disabled by default. However, if you follow the question mark (?), You can use greedy. this is incompatible with Perl. This can also be done through (? U) modifier to get.