How to match hyphens with Regular Expression

Question

How to rewrite the   a-zA-Z0-9     t r n  pattern to match hyphen along with the existing characters

User · Answer

-a-z0-9    a-z0-9-    a-z-0-9   and also  a-z-0-9   all are same The hyphen between two ranges considered as a symbol And also  a-z0-9-      this regex allow hyphen

User · Answer

Is this what you are after   MatchCollection matches   Regex Matches mystring   -

User · Answer

The hyphen is usually a normal character in regular expressions  Only if it   s in a character class and between two other characters does it take a special meaning   Thus     -  matches a hyphen   abc-  matches a  b  c or a hyphen   -abc  matches a  b  c or a hyphen   ab-d  matches a  b  c or d  only here the hyphen denotes a character range

User · Answer

use   p Pd   without quotes to match any type of hyphen  The  -  character is just one type of hyphen which also happens to be a special character in Regex

User · Answer

Escape the hyphen    a-zA-Z0-9     t r n -    UPDATE  Never mind this answer - you can add the hyphen to the group but you don t have to escape it   See Konrad Rudolph s answer instead which does a much better job of answering and explains why

User · Answer

It   s less confusing to always use an escaped hyphen  so that it doesn t have to be positionally dependent  That   s a  - inside the bracketed character class   But there   s something else to consider   Some of those enumerated characters should possibly be written differently   In some circumstances  they definitely should   This comparison of regex flavors says that C  can use some of the simpler Unicode properties  If you   re dealing with Unicode  you should probably use the general category  p L  for all possible letters  and maybe  p Nd  for decimal numbers   Also  if you want to accomodate all that dash punctuation  not just HYPHEN-MINUS  you should use the  p Pd  property  You might also want to write that sequence of whitespace characters simply as  s  assuming that   s not too general for you   All together  that works out to apattern of   p L  p Nd  p Pd      to match any one character from that set   I   d likely use that anyway  even if I didn   t plan on dealing with the full Unicode set  because it   s a good habit to get into  and because these things often grow beyond their original parameters  Now when you lift it to use in other code  it will still work correctly   If you hard-code all the characters  it won   t

[c#] How to match hyphens with Regular Expression?

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