I found the reason, because there is a line break in your file, and the dot star does not support it, so replace it with the following match, and you will succeed! ! ! ! !

String? reg 1？ =? "[\ \ S \ \ S]* Gender \ \ S *(:|)\ S *([\ \ |]*)\ \ |？ [\ \ S \ \ S]* "；

String? reg2？ =? "[\\s\\S]* Nationality \ \ S *:|)\ S *([\ \ |]*)\ \ |? [\ \ S \ \ S]* "；

String? reg3？ =? "[\\s\\S]* Birthday \ \ s * (:|:) \ s * ([\ \ d \-] *) \ |? [\ \ S \ \ S]* "；

String? str？ =? "Gender: Ms | Nationality: Han nationality | Date of birth: 1990-9-22\n"? +

? Marital status: married | Height: 165cm | Weight: 50kg \n? +

? "Registered address: Ronggui Town, Shunde, Guangdong | Current address: Ronggui Town, Shunde, Guangdong";

String? Sex? =? str.replaceAll(reg 1，"$2");

String? mz？ =? str.replaceAll(reg2，"$2");

String? Bryce? =? str.replaceAll(reg3，"$2");

System.out.println？ (sex);

System.out.println？ (mz)；

System.out.println？ (brith)； You changed it. That's not the original I gave you.