Regular Expressions: Is there an AND operator?

Question

Obviously, you can use the | (pipe?) to represent OR, but is there a way to represent AND as well?

Specifically, I\'d like to

Answer 1

In addition to the accepted answer

I will provide you with some practical examples that will get things more clear to some of You. For example lets say we have those three lines of text:

[12/Oct/2015:00:37:29 +0200] // only this + will get selected
[12/Oct/2015:00:37:x9 +0200]
[12/Oct/2015:00:37:29 +020x]

See demo here DEMO

What we want to do here is to select the + sign but only if it's after two numbers with a space and if it's before four numbers. Those are the only constraints. We would use this regular expression to achieve it:

'~(?<=\d{2} )\+(?=\d{4})~g'

Note if you separate the expression it will give you different results.

Or perhaps you want to select some text between tags... but not the tags! Then you could use:

'~(?<=
).*?(?=<\/p>)~g'

for this text:

Hello !
 
I wont select tags! Only text with in
 

See demo here DEMO