正则表达式在段落中找到第一个出现的事件

Question

I have a pattern like " Hello, I am X and My Father's Name is Y. My Hobby's are Playing etc.".

My Target is like to Match the Pattern " Hello, I am X and My ".

I Tried using Regex, but it is always selecting the Second "My".

ie "Hello, I am X and My Father's Name is Y. My "

My Regex is (Hello)(.*)(My?)

I also tried (Hello)(.*)(My?{0}) .But still its not Working.

Can you help me in this?

Answer 1

You need to make the * quantifier lazy :

(Hello)(.*?)(My)

.*? will match as few characters as possible (as opposed to .* which matches as much as it can).

Answer 2

使用非贪婪的方法尝试这个正则表达式。

(Hello.*?My)

Answer 3

try this

Hello(.*?)(?=My)(\w{2})

you have a greedy dinosaur but ? will make it a lazy dinosaur

this is a bad dino who eats everything coming in its way .* and .+ is like that only it will eat everything its greedy

The bad greedy dino will eat everything and then try to match It will try searching for My but he wont be able to find it because he has already eaten them. So, slowly he will start vomiting the letters ....slowly .. one by one unless he finds the y and then the M . so it matches the last My in your string.

When we make it lazy, He wont eat the full string and will be content on finding the first My . he will eat it and go to sleep :)