Regular expression include and exclude special characters

Question

I m finding a regular expression which adheres below rules    Allowed Characters  Alphabet   a-z   A-Z Numbers   0-9 Special Characters               amp        -                              spaces should be allowed   Not Allowed  Special Characters    lt

User · Answer

You haven t actually asked a question  but assuming you have one  this could be your answer     Assuming all characters  except the  Special Characters  are allowed you can write  String regex        lt  gt

User · Answer

a-zA-Z0-9        amp       -                      s     This would do the matching  if you only want to allow that just wrap it in    or any other delimiters that you see appropriate  if you do this no specific disallow logic is needed

User · Answer

For the allowed characters you can use    a-zA-Z0-9                        -      to validate a complete string that should consist of only allowed characters  Note that - is at the end  because otherwise it d be a range  and a few characters are escaped   For the invalid characters you can use    lt  gt           to check for them   To combine both into a single regex you can use       a-zA-Z0-9                        -           lt  gt            but you d need a regex engine that allows lookahead

[java] Regular expression include and exclude special characters

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