问题
There is a common Regex used to slugify urls ~[^\\pL\d]+~u but what does the\\pL in the first preg_replace() mean?
Here are some examples:
- How can I replace ":" with "/" in slugify function?
- http://snipplr.com/view/22741/slugify-a-string-in-php/
- http://sourcecookbook.com/en/recipes/8/function-to-slugify-strings-in-php
- http://www.daniweb.com/web-development/php/threads/471380/php-slugify-two-variables-together
回答1:
\\pL is a Unicode property shortcut. It can also be written as as\p{L} or \p{Letter}. It matches any kind of letter from any language.
回答2:
\\pL is a shorthand for \\p{L}
reference
In addition to the standard notation, \p{L}, Java, PHP, Perl, PCRE and the JGsoft engine allow you to use the shorthand \pL. The shorthand only works with single-letter Unicode properties. \pLl is not the equivalent of \p{Ll}. It is the equivalent of \p{L}l which matches Al or àl or any Unicode letter followed by a literal l.
来源：https://stackoverflow.com/questions/23135114/what-does-the-regex-pattern-pl-do