PHP正则表达式：查找字符串中的所有连续数字序列？

Question

Not sure if regular expressions are the right approach for this, but here is what I am looking to achieve... within a string composed of sorted digits such as 23412167894125123 I would like to extract all sequences of at least 3 consecutive digits:

• 234
• 6789
• 123

Can this be done with regex? Otherwise what could be a sensible approach?

Answer 1

With RegEx, you can use:

(123(?:4(?:5(?:6(?:7(?:89?)?)?)?)?)?|234(?:5(?:6(?:7(?:89?)?)?)?)?|345(?:6(?:7(?:89?)?)?)?|456(?:7(?:89?)?)?|567(?:89?)?|6789?|789)

Try here: https://regex101.com/r/Ap8C2D/1

If you test also with 012…:

(012(?:3(?:4(?:5(?:6(?:7(?:89?)?)?)?)?)?)?|123(?:4(?:5(?:6(?:7(?:89?)?)?)?)?)?|234(?:5(?:6(?:7(?:89?)?)?)?)?|345(?:6(?:7(?:89?)?)?)?|456(?:7(?:89?)?)?|567(?:89?)?|6789?|789)

Test: https://regex101.com/r/zm6I9x/1