The code snippet `line.replaceAll("Time:1[0-9]+ ", "Time:XX ")` performs the following: 1....

The code snippet line.replaceAll("Time:1[0-9]+ ", "Time:XX ") performs the following:

1. line.replaceAll(pattern, replacement) Method:

   • This is a Java method that replaces every substring of the string line matching the regular expression pattern with the specified replacement.

2. Regular Expression Time:1[0-9]+ :

   • Time:: Matches the literal string "Time:".
   • 1: Matches the digit 1.
   • [0-9]+: Matches one or more digits (0 through 9) following the 1.
   • : Matches a single space character at the end.
   • So, the regex pattern Time:1[0-9]+ matches any substring starting with "Time:", followed by the digit 1, followed by one or more digits, and ending with a space.

   Example matches: "Time:12 ", "Time:104 ", "Time:13 ", etc.

3. Replacement Time:XX :

   • All substrings matching the regex Time:1[0-9]+ are replaced with the string "Time:XX ".

Summary:

The code updates the string line by replacing all instances of a time-like structure starting with "Time:1", followed by one or more digits, and ending with a space, with "Time:XX ".

Example:

Input:

String line = "Event started at Time:12 and ended at Time:19 ";
line = line.replaceAll("Time:1[0-9]+ ", "Time:XX ");
System.out.println(line);

Output:

"Event started at Time:XX and ended at Time:XX "