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Xiaobian to share with you how to use regular expressions to solve binary equations, I believe that most people do not know much, so share this article for your reference, I hope you will learn a lot after reading this article. Let's take a look at it!

I really calculated the result according to the regularity written in the original text. Example on php:

Let me explain.

Let's put it in a simple formula: 2x+3y=9

Principle:

Generate such a rule in this function

^ (. *)\ 1 {1} (. *)\ 2 {2} $

To match a repeating string "-" of length 9, and match the length of the two groups, which is the value of his x and y.

Regular explanation:

[(. *)] that is, 0 to countless [.] periods.

\ 1 is to quote a group. The following [{1}] is repeated once.

The second half is\ 2, which is to quote 2 groups. The following [{2}] is repeated once.

The following is the translation of the English blog:

The binary equation 17x + 12y = 51, its expression [^ (. *)\ 1 {16} (. *)\ 2 {11} $]. It's easy to understand. [(. *)] that is, 0 to countless [.] periods. (here is what I said above. In fact, the [.] dot is meant to represent the character "1".)

That is, 0 to countless 1s, which will be referenced once in [\ 1]. Then [{16}] is 16 times. Acts on the previous [\ 1], that is, 16 references. Plus the initial [(. *)], there are exactly 17 times. I won't talk about the last one, just like this one.

The regular engine tries to add 0 to countless characters "1", 0 characters "1", 1 character "1", and 2 characters "1" in [(. *)]. Until successful, try the maximum number of all characters "1" (51 characters "1" in this case).

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