PHP preg_替换多个替换

我对正则表达式的理解很弱，这让我很头疼。我只是想从字符串中提取时间并修改时间的文本。我得到以下形式的字符串：

"Some text I don't care about | 2.3 seconds ago"
"Some text I don't care about | 5.2 minutes ago"
"Some text I don't care about | 7.0 hours ago"
"Some text I don't care about | 1.9 days ago"

我想将上述字符串替换为以下格式：

"2.3 secs"
"5.2 mins"
"7.0 hrs"
"1.9 days"

我知道在正则表达式中替换的基本知识，但要删除我想要的文本前后的多个内容，而将“小时”替换为“小时”，等等超出了我的正则表达式技能水平

任何帮助都将不胜感激

谢谢

编辑：

在搞乱之后，我找到了一个使用多个不同函数的解决方案。我不太喜欢，但它很管用。如果可能的话，我更喜欢单一的preg_替换解决方案。以下是我目前的丑陋解决方案：

$testString = "This is text I don't care about | 7.3 seconds ago";
$testString = array_shift(array_reverse(explode('|', $testString)));
$pattern = array('/seconds/', '/minutes/', '/hours/', '/ago/');
$replace = array('secs', 'mins', 'hrs', '');
$testString = trim(preg_replace($pattern, $replace, $testString));

---

输出为：

7.3秒

preg\u replace

有一个可选的第四个参数，它是一个限制。 限制是它可以替换的最大匹配数。

Php preg_replace

它是自动全局的，这意味着它将替换所有匹配项，除非您为限制输入一个正数

---

preg_replace

有一个可选的第四个参数，它是一个限制。 限制是它可以替换的最大匹配数。

Php preg_replace

它是自动全局的，这意味着它将替换所有匹配项，除非您为限制输入一个正数

---

如果您真的希望在一行上搜索/替换，您可以执行以下操作：

$time_map = array(
  'seconds' => 'secs',
  'minutes' => 'mins',
  'hours'   => 'hrs',
  'days'    => 'days',
);

$data = array(
    "Some text I don't care about | 2.3 seconds ago",
    "Some text I don't care about | 5.2 minutes ago",
    "Some text I don't care about | 7.0 hours ago",
    "Some text I don't care about | 1.9 days ago",
);

foreach ($data as $line) {
    $time_data = preg_replace_callback("/(.*|\s*)([0-9]+\.[0-9]+) (\w+) ago/",  function ($matches) use ($time_map) {return $matches[2] . " " . $time_map[$matches[3]];}, $line);
    print "$time_data\n";
}

产生：

2.3 secs
5.2 mins
7.0 hrs
1.9 days

---

如果您确实希望在一行上搜索/替换，可以执行以下操作：

$time_map = array(
  'seconds' => 'secs',
  'minutes' => 'mins',
  'hours'   => 'hrs',
  'days'    => 'days',
);

$data = array(
    "Some text I don't care about | 2.3 seconds ago",
    "Some text I don't care about | 5.2 minutes ago",
    "Some text I don't care about | 7.0 hours ago",
    "Some text I don't care about | 1.9 days ago",
);

foreach ($data as $line) {
    $time_data = preg_replace_callback("/(.*|\s*)([0-9]+\.[0-9]+) (\w+) ago/",  function ($matches) use ($time_map) {return $matches[2] . " " . $time_map[$matches[3]];}, $line);
    print "$time_data\n";
}

产生：

2.3 secs
5.2 mins
7.0 hrs
1.9 days

---

使用

preg\u match

和

str\u replace

功能的简单解决方案：

$testString = "This is text I don't care about | 7.3 seconds ago";
$timeUnitsmap = ["secs" => "seconds", "mins" => "minutes", "hrs" => "hours"];

preg_match("/\b[0-9.]+? \w+?\b/i", $testString, $matches);
$testString = str_replace(array_values($timeUnitsmap), array_keys($timeUnitsmap), $matches[0]);

print_r($testString);  // "7.3 secs"

...
$testString = preg_replace_callback(["/.*?\b([0-9.]+? )(\w+?)\b.*/"], function($m) use($timeUnitsmap){
    return $m[1]. array_search($m[2], $timeUnitsmap);
}, $testString);

或者使用

preg\u replace\u回调

和

array\u search

函数：

$testString = "This is text I don't care about | 7.3 seconds ago";
$timeUnitsmap = ["secs" => "seconds", "mins" => "minutes", "hrs" => "hours"];

preg_match("/\b[0-9.]+? \w+?\b/i", $testString, $matches);
$testString = str_replace(array_values($timeUnitsmap), array_keys($timeUnitsmap), $matches[0]);

print_r($testString);  // "7.3 secs"

...
$testString = preg_replace_callback(["/.*?\b([0-9.]+? )(\w+?)\b.*/"], function($m) use($timeUnitsmap){
    return $m[1]. array_search($m[2], $timeUnitsmap);
}, $testString);

---

使用

preg\u match

和

str\u replace

功能的简单解决方案：

$testString = "This is text I don't care about | 7.3 seconds ago";
$timeUnitsmap = ["secs" => "seconds", "mins" => "minutes", "hrs" => "hours"];

preg_match("/\b[0-9.]+? \w+?\b/i", $testString, $matches);
$testString = str_replace(array_values($timeUnitsmap), array_keys($timeUnitsmap), $matches[0]);

print_r($testString);  // "7.3 secs"

...
$testString = preg_replace_callback(["/.*?\b([0-9.]+? )(\w+?)\b.*/"], function($m) use($timeUnitsmap){
    return $m[1]. array_search($m[2], $timeUnitsmap);
}, $testString);

或者使用

preg\u replace\u回调

和

array\u search

函数：

$testString = "This is text I don't care about | 7.3 seconds ago";
$timeUnitsmap = ["secs" => "seconds", "mins" => "minutes", "hrs" => "hours"];

preg_match("/\b[0-9.]+? \w+?\b/i", $testString, $matches);
$testString = str_replace(array_values($timeUnitsmap), array_keys($timeUnitsmap), $matches[0]);

print_r($testString);  // "7.3 secs"

...
$testString = preg_replace_callback(["/.*?\b([0-9.]+? )(\w+?)\b.*/"], function($m) use($timeUnitsmap){
    return $m[1]. array_search($m[2], $timeUnitsmap);
}, $testString);

---

要逐个替换多个字符串，还是要替换包含多个句子的单个字符串？字符串将逐个处理可以使用一个正则表达式调用一个preg_replace。要逐个替换多个字符串，或者对于包含多个句子的单个字符串？字符串将逐个处理。可以使用一个preg_replace调用和一个regex。