Several rules of the regular expression engine

Source: Internet
Author: User
Tags expression engine

The rule 1:regex engine matches the input string as soon as it starts. It searches for one character at a time until a match is found

Rule 2: After a matching start is found, the Regex engine will continue to match until it encounters a character that is not received by the pattern

The rule 3:regex engine is very greedy--as long as the pattern allows, it will match as many characters as possible

The rule 4:regex engine is eager to implement a match, so it will backtrack as needed to achieve a match

The rule 5:regex engine always chooses the first option

  

Several rules of the regular expression engine

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.