Regex match for new lines

问题

I am trying to get the log statements in my code using java. I am using this regex:

Log\.[dD].*\);

Test data:

Log.d(TAG, "Construct product info");

test test test test 

Log.d(TAG, "Loading Product Id: %d, Version: %s",
    productInfo.getProductId(),
    productInfo.getProductVersion());

test test test test 

Log.d(TAG, "Loading Product Id: " +
    ProductId + "Version:" +
    Version);

test test test test

for some reason, regex is only picking up 1st line which is

Log.d(TAG, "Construct product info");

Correct output should be:

Log.d(TAG, "Construct product info");

Log.d(TAG, "Loading Product Id: %d, Version: %s",
    productInfo.getProductId(),
    productInfo.getProductVersion());

Log.d(TAG, "Loading Product Id: " +
    ProductId + "Version:" +
    Version);

https://regex101.com/r/OCl9dy/3

If I am not mistaken, regex should return all Log.[dD] statements that ends with );

Please let me know why it does not pick up others and how to fix this.

thanks

回答1:

This regex should work:

Log\.[dD][\s\S]*?\);

The two mistakes you made were:

. does not match line endings. You should use something similar to [\s\S], which matches everything.
You need to match lazily, stop matching at the first ) you see. So write *? instead of *.

Note that the regex won't work for things like Log.d(TAG, "Construct (product); info"); because the first ); is not the end of the method call. To match these, I suggest you write/use a parser.

Demo

来源：https://stackoverflow.com/questions/51060391/regex-match-for-new-lines

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