To replace all the semi-colons with hyphens, we can use the following:
input = input.replaceAll(";", "-");
To remove all the non-digits from the input, we can use:
input = input.replace("\\D+", "");
To replace all the leading and trailing commas from an input, we can use an alternation regex:
input = input.replaceAll("^,+|,+$", "");
To replace all the occurrences of two or more white spaces with a single space, we can use:
input = input.replaceAll("\\s{2,}, " ");
How can we escape all the dollar signs that are just before the % character? In other words, to replace all the occurrences of $% with \$%, we can use:
input = input.replaceAll("\\$%", "\\\\\\$%");
Note that we are using \\\\ (four backslashes) ...
