How to evaluate Regular expression?

Question

I have come across the following regular expression in a program and struggling to understand what is trying to do. Can anyone help me please? I have only started to learn this

l = Z + lo <= lf ? lo : lf - z;

The question is not well researched, does not show any steps or effort taken in solving the problem first. That is enough for a downvote, and I didn't even downvote it. — Vasili Syrakis, Feb 05 '14 at 02:00

score 1 · Accepted Answer · edited May 23 '17 at 12:03

1

That's most likely the use of a ternary operator, despite its cryptic appearance which is usually attributed to RegExps:

l = ((z + lo) <= lf) ? lo : (lf - z);

This is another way of writing the following:

if(z + lo <= lf)
    l = lo;
else
    l = lf - z;

This doc covers the ternary operator:

http://docs.oracle.com/javase/tutorial/java/nutsandbolts/op2.html

Related SO post:

How does the ternary operator work?

Edit: The code you posted can be used as a Regex: http://www.rubular.com/r/Svr9S7EaCP

edited May 23 '17 at 12:03

Community

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answered Feb 05 '14 at 01:37

pcnThird

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Thank you for clarifying this. much helpful. I am a bit embarrassed now for mistaking this – user3273276 Feb 05 '14 at 02:03

How to evaluate Regular expression?

1 Answers1