How to Extract a Substring Between Delimiters Using the Substring Method?

Method to extract substrings between delimiters

When processing strings, you may need to extract specific substrings based on a given delimiter. This example demonstrates how to preserve the text between "key:" and "-". While regular expressions are commonly used for such tasks, here's a simpler alternative.

Use Substring method

With clever use of Substring methods, you can achieve your goals without regular expressions. The following are the specific steps:

<code class="language-java">String St = "super example of string key : text I want to keep - end of my string";

int pFrom = St.indexOf("key : ") + "key : ".length();
int pTo = St.lastIndexOf(" - ");

String result = St.substring(pFrom, pTo - pFrom);</code>

Let’s analyze it step by step:

• indexOf Finds the starting position of the substring ("key: ").
• Add the length of the delimiter string to get the actual starting point.
• lastIndexOf Finds the end position of the substring ("-").
• Finally, substring completes the extraction work and intercepts the substring within the specified range.

This method avoids complex regular expressions and is relatively simple and straightforward to implement.

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