im very new to regex and have been trying to create an expression which creates validation for a path. Below are the rules I would like to include
- MUST begin and end with forward slash e.g /example/
- path name must be between 1-63 characters
- no upper case characters allowed
- no spaces
- can only contain the following symbols "-", ".", "_", "~"
This is what I currently have ^((?/)[a-z0-9]{1,63}/)$
Can someone please tell me how to include the rules above?
Thankyou!
EDIT image showing error on regex101.com
CodePudding user response：
You can use
^/[a-z0-9._~-]{1,61}/$
Or, if you plan to add more specific parts to the pattern, a lookahead version will become handier:
^(?=.{1,63}$)/[a-z0-9._~-] /$
See the regex demo #1 and regex demo#2. Note that in the C# code, where you define regexes with regular or verbatim string literals, you do not need to escape slashes as they are not special regex chars.
Details:
^- start of string anchor(?=.{1,63}$)- a positive lookahead that requires the string to contain one to 63 chars other than line break chars till the end of string/- a/char[a-z0-9._~-]{1,61}- one to 61 lowercase ASCII letters, digits,.,_,~, or-chars[a-z0-9._~-]- one or more lowercase ASCII letters, digits,.,_,~, or-chars/- a/char$- end of string.
CodePudding user response：
Try RegexPlus or dk.brics.automaton, as it allows &-operator so that you could write:
/(\w{1,63})&(http...)/