我正在构建一个本地事件日历,它采用RSS提要和网站抓取并从中提取事件日期.

我之前已经问过如何从PHP here中的文本中提取日期,并在MarcDefiant时获得了一个很好的答案：

function parse_date_tokens($tokens) {

# only try to extract a date if we have 2 or more tokens

if(!is_array($tokens) || count($tokens) < 2) return false;

return strtotime(implode(" ", $tokens));

}

function extract_dates($text) {

static $patterns = Array(

'/^[0-9]+(st|nd|rd|th|)?$/i', # day

'/^(Jan(uary)?|Feb(ruary)?|Mar(ch)?|etc)$/i', # month

'/^20[0-9]{2}$/', # year

'/^of$/' #words

);

# defines which of the above patterns aren't actually part of a date

static $drop_patterns = Array(

false,

false,

false,

true

);

$tokens = Array();

$result = Array();

$text = str_word_count($text, 1, '0123456789'); # get all words in text

# iterate words and search for matching patterns

foreach($text as $word) {

$found = false;

foreach($patterns as $key => $pattern) {

if(preg_match($pattern, $word)) {

if(!$drop_patterns[$key]) {

$tokens[] = $word;

}

$found = true;

break;

}

}

if(!$found) {

$result[] = parse_date_tokens($tokens);

$tokens = Array();

}

}

$result[] = parse_date_tokens($tokens);

return array_filter($result);

}

# test

$texts = Array(

"The focus of the seminar, on Saturday 2nd February 2013 will be [...]",

"Valentines Special @ The Radisson, Feb 14th",

"On Friday the 15th of February, a special Hollywood themed [...]",

"Symposium on Childhood Play on Friday, February 8th",

"Hosting a craft workshop March 9th - 11th in the old [...]"

);

$dates = extract_dates(implode(" ", $texts));

echo "Dates: \n";

foreach($dates as $date) {

echo " " . date('d.m.Y H:i:s', $date) . "\n";

}

但是,该解决方案有一些缺点 – 首先,它无法匹配日期范围.

我现在正在寻找一种更复杂的解决方案,可以从示例文本中提取日期,时间和日期范围.

这是最好的方法吗？看起来我正在靠回一系列正则表达式语句,一个接一个地运行以捕获这些情况.我无法看到更好的方法来捕捉日期范围,但我知道必须有更好的方法来做到这一点.是否有任何库只用于PHP中的日期解析？

根据要求,日期/日期范围样本

$dates = [

" Saturday 28th December",

"2013/2014",

"Friday 10th of January",

"Thursday 19th December",

" on Sunday the 15th December at 1 p.m",

"On Saturday December 14th ",

"On Saturday December 21st at 7.30pm",

"Saturday, March 21st, 9.30 a.m.",

"Jan-April 2014",

"January 21st - Jan 24th 2014",

"Dec 30th - Jan 3rd, 2014",

"February 14th-16th, 2014",

"Mon 14 - Wed 16 April, 12 - 2pm",

"Sun 13 April, 8pm",

"Mon 21 - Wed 23 April",

"Friday 25 April, 10 – 3pm",

"The focus of the seminar, on Saturday 2nd February 2013 will be [...]",

"Valentines Special @ The Radisson, Feb 14th",

"On Friday the 15th of February, a special Hollywood themed [...]",

"Symposium on Childhood Play on Friday, February 8th",

"Hosting a craft workshop March 9th - 11th in the old [...]"

];

我目前正在使用的功能(不是上述功能)大约90％准确.它可以捕获日期范围,但如果还指定了时间则有困难.它使用正则表达式列表,非常复杂.

更新：2014年1月6日

我正在研究执行此操作的代码,使用一系列正则表达式的原始方法依次运行.我认为我接近一个可以从一段文本中提取几乎任何日期/时间范围/格式的工作解决方案.当我完成后,我会在这里发布它作为答案.