Regular expression a-zA-Z or a-zA-Z

Question

Is there a difference between   a-zA-Z  and   a-zA-Z     When I check in C    Regex IsMatch  t      a-zA-Z        Returns true  I think it s correct   Regex IsMatch  t      a-zA-Z        Returns false   There are a lot of web sites using   a-zA-Z  for the alphabet  I m not really sure which one is correct answer

User · Answer

a-zA-Z  means any a-z or A-Z at the start of a line    a-zA-Z  means any character that IS NOT a-z OR A-Z

User · Answer

outside of the character class    a-zA-Z    notes that it is the  begins with  operator    inside of the character negates the specified class   So     a-zA-Z   translates to  begins with character from a-z or A-Z   and    a-zA-Z   translates to  is not either a-z or A-Z   Here s a quick reference  http   www regular-expressions info reference html

User · Answer

There is a difference   When the   character appears outside of    matches the beginning of the line  or string    When the   character appears inside the     it matches any character not appearing inside the

User · Answer

Yes  the first means  match all strings that start with a letter   the second means  match all strings that contain a non-letter   The caret       is used in two different ways  one to signal the start of the text  one to negate a character match inside square brackets

[c#] Regular expression "^[a-zA-Z]" or "[^a-zA-Z]"

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