PHP uses regular expressions to match Chinese characters. some of them cannot be matched.

PHP uses regular expressions to match Chinese characters. some of the solutions that cannot be matched are required during development today, that is, matching the material text in a billing formula. for example: [goat fat jade price] * [goat fat jade weight] + [platinum price] * [platinum weight] + [Hao Stone price] * [Hao stone weight] + [diamond price] * 1.5 * [diamond weight] + [hard gold price] * 1.67 * [hard gold weight], to match the [*** _ price], it is the string ending with _ Price in brackets (representing the name of the material). the language I use is PHP, the code is as follows:

$ Pattern = "// \ [([^ _ Price] +) _ price \]/"; $ res = preg_match_all ($ pattern, $ s, $ matches ); var_dump ($ matches );

, The first three can match, but the "diamond" cannot match, which is very strange. I tested it later and it has nothing to do with the matching quantity, because if you change "diamond" to "Platinum", it can be matched. if you change it to "stone", it can also be matched. Judging from this phenomenon, it may be a problem with character sets. it may be that the default character set does not contain the word "drill", so it cannot be matched, after searching for articles by many netizens about using regular expressions to match Chinese characters in PHP, we found that the most comprehensive matching method was in hexadecimal format. after the change, it was successful, the final code is as follows:
$ S = '[goat fat jade price] * [goat fat jade weight] + [platinum price] * [platinum weight] + [Hao Stone price] * [Hao stone weight] + [diamond price] * 1.5 * [diamond weight] + [price of hard gold] * 1.67 * [weight of hard gold] ';

$ Pattern = "// \ [([\ x {4e00}-\ x {9fa5}] +) _ price \]/u "; $ res = preg_match_all ($ pattern, $ s, $ matches); var_dump ($ matches );

In this way, you can extract all the goat fat jade, platinum, Hao Stone, diamond, and hard gold.

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