How Can I Extract a Substring Between Two Specific Character Sequences in a String?

Extracting Text Segments from Strings

A common string manipulation task involves isolating a specific substring located between two known marker sequences. Let's illustrate this with a clear example.

Consider the string: "super example of string key : text I want to keep - end of my string". Our objective is to extract only the text between "key : " and "-". We'll avoid complex regular expressions and opt for a simpler, more direct method.

This can be achieved using the Substring method. This method requires two arguments: the starting index of the substring and its length.

Solution Implementation:

<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>

The code first finds the index of "key : " and adjusts the starting position (pFrom) to be just after the marker. It then finds the last occurrence of " - " to determine the ending position (pTo). Finally, it extracts the substring from pFrom to a length calculated as the difference between pTo and pFrom.

The result variable will now contain the desired substring: "text I want to keep". This method offers a clear and efficient solution without the need for intricate regular expression patterns.

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