回答編集履歴
2
^$を追加
answer
CHANGED
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@@ -2,7 +2,7 @@
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2
2
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<?php
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3
3
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$dates = array("2010-09-01", "2010.10.12", "2010-8-2", "2010-10-2", "2010-5-12");
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4
4
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foreach ($dates as $date) {
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5
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-
if (preg_match('/(\d{4})\D(\d{1,2})\D(\d{1,2})/', $date, $m)) {
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5
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+
if (preg_match('/^(\d{4})\D(\d{1,2})\D(\d{1,2})$/', $date, $m)) {
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6
6
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echo sprintf('%4d/%02d/%02d', $m[1], $m[2], $m[3]) . '<br>';
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7
7
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}
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8
8
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}
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1
test
answer
CHANGED
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@@ -2,12 +2,12 @@
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2
2
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<?php
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3
3
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$dates = array("2010-09-01", "2010.10.12", "2010-8-2", "2010-10-2", "2010-5-12");
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4
4
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foreach ($dates as $date) {
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5
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-
if (preg_match('/(\d{4})
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5
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+
if (preg_match('/(\d{4})\D(\d{1,2})\D(\d{1,2})/', $date, $m)) {
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6
6
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echo sprintf('%4d/%02d/%02d', $m[1], $m[2], $m[3]) . '<br>';
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7
7
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}
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8
8
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}
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9
9
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```
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10
10
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11
11
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正規表現で解いてみました。
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12
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-
数字4桁,
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12
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+
数字4桁, 数字以外の1文字, 数字1または2桁, 数字以外の1文字, 数字1または2桁
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13
13
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にマッチします。
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