前言
正規式搜尋在第一個符合時終止(Regular expression to stop at first match)
非貪婪模式 - (.*?)
PHP Pattern Modifiers的 U (PCRE_UNGREEDY)
https://www.php.net/manual/en/reference.pcre.pattern.modifiers.php Pattern Modifiers
https://stackoverflow.com/a/37347478 PHP preg_match and preg_match_all functions
找HTML字串tag標籤里的內容：
<b>example: </b><div align=left>this is a test</div>
preg_match_all(
"|<[^>]+>(.*)</[^>]+>|U",
"<b>example: </b><div align=left>this is a test</div>",
$matches
);
2 => 會有2個結果
$matches
array (
0 =>
array (
0 => '<b>example: </b>',
1 => '<div align=left>this is a test</div>',
),
1 =>
array (
0 => 'example: ',
1 => 'this is a test',
),
)
U - PHP的非貪婪模式修飾符
$matches[1] is an array of strings matched by the first parenthesized sub-pattern
$matches[1] 是第一個帶刮號括號（()）的子模式匹配的陣列 => (.*)
正則用“|”是避免“/”的衝突，或是正則中跳脫“/”
preg_match_all(
"/<[^>]+>(.*)<\/[^>]+>/U",
"<b>example: </b><div align=left>this is a test!</div>",
$matches
);
不使用非貪婪修飾符U
preg_match_all(
"/<[^>]+>(.*?)<\/[^>]+>/",
"<b>example: </b><div align=left>this is a test!</div>",
$matches
);
其他
preg_match_all("/\{([\w\d_]+)\}/", "?new_year={year}&new_month={month}&new_day={day}", $matches)
3
$matches
array (
0 =>
array (
0 => '{year}',
1 => '{month}',
2 => '{day}',
),
1 =>
array (
0 => 'year',
1 => 'month',
2 => 'day',
),
)
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