### String Interpolation with Default Lookups

Source: https://github.com/apache/commons-text/blob/master/src/main/javadoc/overview.html

Use StringSubstitutor.createInterpolator() to create an interpolator with default lookups. This example shows various lookup types including base64, constants, dates, environment variables, file content, and system properties.

```java
final StringSubstitutor interpolator = StringSubstitutor.createInterpolator();
final String text = interpolator.replace(
    "[Base64 Decoder](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#base64DecoderStringLookup()):        ${base64Decoder:SGVsbG9Xb3JsZCE=}\n" +
    "[Base64 Encoder](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#base64EncoderStringLookup()):        ${base64Encoder:HelloWorld!}\n" +
    "[Java Constant](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#constantStringLookup()):         ${const:java.awt.event.KeyEvent.VK_ESCAPE}\n" +
    "[Date](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#dateStringLookup()):                  ${date:yyyy-MM-dd}\n" +
    "[Environment Variable](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#environmentVariableStringLookup()):  ${env:USERNAME}\n" +
    "[File Content](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#fileStringLookup(java.nio.file.Path...))():          ${file:UTF-8:src/test/resources/document.properties}\n" +
    "[Java](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#javaPlatformStringLookup()):                  ${java:version}\n" +
    "[Local host](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#localHostStringLookup()):            ${localhost:canonical-name}\n" +
    "[Loopback address](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#localHostStringLookup()):      ${loopbackAddress:canonical-name}\n" +
    "[Properties File](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#propertiesStringLookup(java.nio.file.Path...))():       ${properties:src/test/resources/document.properties::mykey}\n" +
    "[Resource Bundle](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#resourceBundleStringLookup(java.lang.String))():       ${resourceBundle:org.apache.commons.text.example.testResourceBundleLookup:mykey}\n" +
    "[System Property](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#systemPropertyStringLookup()):       ${sys:user.dir}\n" +
    "[URL Decoder](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#urlDecoderStringLookup()):           ${urlDecoder:Hello%20World%21}\n" +
    "[URL Encoder](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#urlEncoderStringLookup()):           ${urlEncoder:Hello World!}\n" +
    "[XML Decoder](https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html#xmlDecoderStringLookup()):           ${xmlDecoder:<element>}\n")
```

--------------------------------

### Create Default String Substitutor (Commons Text >= 1.8)

Source: https://github.com/apache/commons-text/blob/master/src/main/javadoc/overview.html

Create a default, full-featured StringSubstitutor using the createInterpolator() method. This is the recommended approach for versions 1.8 and later.

```java
org.apache.commons.text.StringSubstitutor.createInterpolator()
```

--------------------------------

### Create Default String Substitutor (Commons Text < 1.8)

Source: https://github.com/apache/commons-text/blob/master/src/main/javadoc/overview.html

Instantiate a default StringSubstitutor using StringLookupFactory for versions prior to 1.8. This provides a full set of interpolation capabilities.

```java
new StringSubstitutor(StringLookupFactory.INSTANCE.interpolatorStringLookup())
```

--------------------------------

### Replace System Properties in String

Source: https://github.com/apache/commons-text/blob/master/src/main/javadoc/overview.html

Use StringSubstitutor to replace Java System properties within a string. This is useful for dynamic configuration or templating.

```java
StringSubstitutor.replaceSystemProperties("You are running with java.version = ${java.version} and os.name = ${os.name}.");
```

--------------------------------

### Add Apache Commons Text Dependency

Source: https://github.com/apache/commons-text/blob/master/README.md

Include this XML snippet in your Maven project's pom.xml to add Apache Commons Text as a dependency.

```xml
<dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-text</artifactId>
  <version>1.15.0</version>
</dependency>
```

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