Hi Uri,

I was reading this page:
https://www.rexegg.com/regex-lookarounds.html

the content of "Mastering Lookahead and Lookbehind" make me confused.

(?=foo)
(?<=foo)
(?!foo)
(?<!foo)

They are too hard to understand for.
In my opinion PHP doesn't have this kind of stuff.

How do you think it?


On 2018/7/13 星期五 AM 11:18, Uri Guttman wrote:
but seriously, regexes are a key feature in perl and most modern languages. it is hard to do any text or data processing without them. i recommend you read those tutorials mentioned earlier and possibly other materials. stay away from most 'perl' or 'regex' tutorials on the net as many are very poorly written and full of mistakes.

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