I have the current expression:

/(?<![http://|https://|#])#([\d\w] [^\d\s<] [^\s<>] )/g

However it's not compatible to run on Safari. I'm trying to handle the following cases:

#tag => match
#123 => no match
#32bit => match
##tag => no match
http://google.com/#/test => no match
tag##tag => no match
tag#tag => no match
<p>#tag</p> => match only #tag
#tag. => match only #tag
tag## => no match
tag# => no match
this is a match #tag => only #tag 

I wonder how I can make a character before the match result in a negative match. E.g. # and /.

Is there any alternative to negative look behind that is compatible with Safari?

Thanks in advance.

CodePudding user response：

You might use a negated character class and a capture group, and make sure that there are not only digits.

Note that \w also matches \d

(?:^|[^\w#/])(#(?!\d \b)\w )\b

Explanation

• (?: Non capture group
  • ^ Assert the start of the string
  • | Or
  • [^\w#/] Match a single non word char other than # or /
• ) Close non capture group
• ( Capture group 1
  • # Match literally
  • (?!\d \b) Negative lookahead, assert not only digits to the right followed by a word boundary
  • \w Match 1 word characters
• ) Close group 1
• \b A word boundary to prevent a partial word match