Negate match for word in the beginning of string in RE2 syntax?

问题

Let's say that I have following strings:

• mail to
• tel:+358123456
• http://www.google.fi
• mailto:foo@bar.fi
• hello world
• telephone
• elephant
• penny
• link
• owl

How can I find only strings that do not start with 'tel:', 'http://' and 'mailto:' in RE2 syntax?

I've tried following with following syntax, but it filters out all of them:

[^(https?://|tel:|mailto:)]

edit: RE2 syntax does not support negative lookbehind/lookahead.

回答1:

There is no drop-in workaround for the lack of negative lookbehind on RE2 that I know of.

Why don't you match on strings that do start with those keywords instead? Then you can dismiss those.

来源：https://stackoverflow.com/questions/32844945/negate-match-for-word-in-the-beginning-of-string-in-re2-syntax