php - 正则表达式匹配电报用户名并在 PHP 中删除整行

Question

我想在消息文本中匹配 Telegram 用户名并删除整行，我试过这种模式，但问题是它也匹配电子邮件:.*(@(?=.{5,64}(?:\s|$))(?![_])(?!.*[_]{2})[a-zA-Z0-9_]+(?<![_.])).*模式应该匹配所有这些行:
嗨@username 你好吗？
嗨@username.你好吗？
😉@用户名。
并且不应该像这样匹配电子邮件:
嗨，电子邮件到 something@domain.com

Answer 1

用

.*\B@(?=\w{5,64}\b)[a-zA-Z0-9]+(?:_[a-zA-Z0-9]+)*.*

见 proof \B之前 @意味着在 @ 之前必须有一个非单词字符或字符串的开头.
说明

NODE                     EXPLANATION
--------------------------------------------------------------------------------
  .*                       any character except \n (0 or more times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  \B                       the boundary between two word chars (\w)
                           or two non-word chars (\W)
--------------------------------------------------------------------------------
  @                        '@'
--------------------------------------------------------------------------------
  (?=                      look ahead to see if there is:
--------------------------------------------------------------------------------
    \w{5,64}                 word characters (a-z, A-Z, 0-9, _)
                             (between 5 and 64 times (matching the
                             most amount possible))
--------------------------------------------------------------------------------
    \b                       the boundary between a word char (\w)
                             and something that is not a word char
--------------------------------------------------------------------------------
  )                        end of look-ahead
--------------------------------------------------------------------------------
  [a-zA-Z0-9]+             any character of: 'a' to 'z', 'A' to 'Z',
                           '0' to '9' (1 or more times (matching the
                           most amount possible))
--------------------------------------------------------------------------------
  (?:                      group, but do not capture (0 or more times
                           (matching the most amount possible)):
--------------------------------------------------------------------------------
    _                        '_'
--------------------------------------------------------------------------------
    [a-zA-Z0-9]+             any character of: 'a' to 'z', 'A' to
                             'Z', '0' to '9' (1 or more times
                             (matching the most amount possible))
--------------------------------------------------------------------------------
  )*                       end of grouping
--------------------------------------------------------------------------------
  .*                       any character except \n (0 or more times
                           (matching the most amount possible))