Regular. How to determine the presence of a certain fragment inside []?

• 0
  Hello!
  I have the following problem, there is some text that needs to be checked for the presence of non-alphabetic characters, but possibly having numbers and the "_" symbol, for this a simple regular pattern like the following worked:
  ^ [\ W \ d \ _ ] + $
  Further, it was also necessary to take into account that a piece of text can have an html representation of a character, for example & amp; amp; , which is easily determined, but I just don't know how to make this fragment take into account inside the square brackets of the regularity. Tried it like this:
  ^ [\ W \ d \ _ (\ & amp; amp \;)] + $ (for starters, I wanted to just & amp; amp ; defined), but in this way the regex does not define a fragment in parentheses, but simply one of the characters in those parentheses.
  The question is how to compose a regular line so that it correctly detects the presence of a given html character code, while the rest of the text should not contain any alphabetical characters.
  For example, here is the text that this regular should correctly define:
  

  2345093489394-
  
  &
  
  _==+_)([email protected]#$%^&!///......000

  
  , but the text that should not match the regular.
  

  2345093489394-
  
  amp
  
  _==+_)([email protected]#$%^&!///......000

  
  I hope for your help. I have nothing to do with myself, I have been sitting for half a day over this problem and all without results.
  Thanks to everyone who responds!

  C++ Anonymous, Apr 20, 2019

---

1 Answers
• 0
  ^ ([\ W \ d \ _] | \ & amp; amp \;) + $
  
  This regex does not solve the problem with the "fragment inside []", but the mentioned lines should be processed normally.

  Anonymous

---