How to Split a String with Letters and Numbers into Alternating Segments in Java?

Separating Letters and Numbers in a String

In Java, you can encounter the need to split a string that contains both letters and digits into alternating segments. For instance, given the string "123abc345def," you might aim for the following result:

x[0] = "123"
x[1] = "abc"
x[2] = "345"
x[3] = "def"

To achieve this precise separation, you can employ the following regular expression:

str.split("(?<p>This pattern splits the string at specific points based on two conditions:</p>

• (?
• (?

By splitting the string at these positions, you can isolate the alternating segments of letters and numbers.

Explanation of the Regexp:

• \D: Matches any non-digit character.
• \d: Matches any digit character.
• (?
• (?=): Positive lookahead, matching a pattern immediately after the current position.

Example Usage:

String str = "123abc345def";
String[] x = str.split("(?<p>After executing the above code, the x array will contain the alternating segments as desired:</p>
<pre class="brush:php;toolbar:false">x[0] = &quot;123&quot;
x[1] = &quot;abc&quot;
x[2] = &quot;345&quot;
x[3] = &quot;def&quot;</pre>
<p>This technique enables you to efficiently separate letters and digits in a string, allowing you to process them according to their types.</p>

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