Learning regex with pictures — Lookahead and Lookbehind

REGEX.md

Regex — How to remember lookahead and lookbehind

Here is regex

Match advances start to end

So head is facing to end

Behind is facing to start

Match advances past to future

Toward to future is head direction.

Toward to past is behind direction.

See carefully Lookbehind syntax includes left arrow toward to Start

Reversibly Lookahead syntax does not include right arrow toward to End

But I think naturally time advances Start to End means Past to Future so right arrow is omitted.

Links

• Regex — How to remember Start caret and End dollar ( Sun and Music )
• Qiita—Japanese
• Medium—imported