replaceall

A Scala method to replace a few “bad” characters

Here’s a little Scala method I wrote to replace some “bad” characters that won’t print properly on my Radio Pi display:

def replaceBadCharacters(s: String): String = {
    s.replaceAll("“", "\"")
     .replaceAll("”", "\"")
     .replaceAll("‘", "\"")
     .replaceAll("’", "\"")
}

There are other ways to solve this problem, but I threw this together as a quick patch until I can figure out why the Phosphor screen saver on the Raspberry Pi won’t print those characters that I’m replacing.

Methods on the Scala collections classes, organized by category alvin November 18, 2017 - 4:10pm

When I wrote the Scala Cookbook, I gave each recipe and then each chapter my full attention. I thought that if I wrote each recipe as well as possible, and included important recipes in each chapter, well, I wanted each chapter to be worth the price of the entire book. That was my goal.

As a result of this effort -- and perhaps to the chagrin of my editor -- the Scala collections chapters ended up being 130 pages in length.

How to use multiple regex patterns with replaceAll (Java String class)

Table of Contents1 - 1) A simple string2 - 2) Replace multiple patterns in that string3 - 3) More explanation4 - Multiple search patterns5 - Summary

Java FAQ: How can I use multiple regular expression patterns with the replaceAll method in the Java String class?

Here’s a little example that shows how to replace many regular expression (regex) patterns with one replacement string in Scala and Java. I’ll show all of this code in Scala’s interactive interpreter environment, but in this case Scala is very similar to Java, so the initial solution can easily be converted to Java.

Java - strip unwanted characters from a string

Here's a quick line of Java code that takes a given input string, strips all the characters from that string other than lowercase and uppercase letters, and returns whatever is left:

Java String replaceAll - why isn’t my “replace” method working?

Java String replace FAQ: Why isn't my Java String replace / replaceAll / replaceFirst code working?

The Java String class has several methods that usually make it really easy to replace one text pattern with another. I say "usually" because what occassionally happens is that I forget that a Java String is immutable (it can't be changed), so I accidentally try some String replace, replaceAll, or replaceFirst code that looks like this: