How to Replace All Special Characters Except for Underscore and Numbers in Java?

Question

I want to replace all special characters from the string object BusDetails below with a blank "" except for _(underscore) and numbers in java ?

BusDetails=BusDetails.replaceAll("&#151;", "").replaceAll("\\s+","_").replaceAll("ROUTE", "BUS").replaceAll("-", "_");

Accepted Answer

BusDetails = BusDetails.replaceAll("[^a-zA-Z0-9_-]", "");

Using the regex pattern "[^a-zA-Z0-9_-]" we can replace all special characters (symbols) from the string except letters, numbers and '_'.

Accepted Answer

This should fix it:

BusDetails=BusDetails.replaceAll("(\\W|^_)*", "");

The pattern (\\W|^_) matches any non-word character. Additionally it excludes _.

Answer 3

BusDetails=BusDetails.replaceAll("[^_0-9]+", "");

This retain integer numbers but not decimals (add a "." for that)

3 Answers