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https://issues.apache.org/jira/browse/PDFBOX-5823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17848329#comment-17848329
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Jonathan Prates commented on PDFBOX-5823:
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[~lehmi] I believe asPredicate() will instantiate a Matcher, that could cause
the same high memory utilisation.
> StringUtil.PATTERN_SPACE memory optmisation
> -------------------------------------------
>
> Key: PDFBOX-5823
> URL: https://issues.apache.org/jira/browse/PDFBOX-5823
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Affects Versions: 3.0.3 PDFBox
> Reporter: Jonathan Prates
> Assignee: Andreas Lehmkühler
> Priority: Minor
> Fix For: 3.0.3 PDFBox, 4.0.0
>
> Attachments: Main.java, Screenshot 2024-05-19 at 22.39.10.png,
> Screenshot 2024-05-19 at 22.40.17.png
>
>
> PDAbstractContentStream uses StringUtil.PATTERN_SPACE regexp to evaluate if a
> word has a space in it
> ([https://github.com/apache/pdfbox/blob/trunk/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/PDAbstractContentStream.java#L1624])
> For large documents ~800 pages and small string sequences (like a regular
> word), it causes a memory overhead (see attached), due to the several extra
> allocations. I've replaced the regexp for space and \t using word.contains,
> and since it's a O ( 1 ) operation that does not require extra allocations,
> memory used has been reduced.
> What would be the implications of replacing this block for contains()?
> Since \s is [ \t\n\x0B\f\r], I believe we have a simplified version to
> allocate less memory.
>
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