如何在Java中使用正则表达式删除字符串的一部分

Question

I am comparing file names in a folder ,I want to remove some part of string and check whether name exists or not

Here is my file name :

file1Name:AB-05012_MM-AB_585859_01 
file2Name:AB-05012_MM-AB_732320_01-1

Now i want to compare the string only till

AB-05012_MM-AB_732320_01 ignore '-1'

Here is my logic

if (file1Name.equals(file2Name.contains(""))){
  list.add(file1Name);           
}

Answer 1

When you know there is an extra character in second file name then why not using

fileName2.startsWith ( fileName1)

or

int indexOfDot = fileName1.lastIndexOf(".");
fileName2.startsWith ( fileName1.subString( 0, indexOfDot)

But this is very specific to your problem. or for the cases where
fileName2 = fileName1 + any character or digit

Answer 2

您可以尝试以下方法：

String myStr = str.substring(0, str.lastIndexOf("-1")); 

Answer 3

if your file name is same length:

if (file1Name.equals(file2Name.substring(0,24))){
 //if same to some  task              
}

else:

if (file1Name.equals(file2Name.substring(0,file2Name.lastIndexOf('-')))){
 //if same to some  task              
}

And I think the second solution better.