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https://issues.apache.org/jira/browse/GROOVY-2456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18092258#comment-18092258
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Paul King commented on GROOVY-2456:
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See proposed fix in GROOVY-9848
> Support in-Keyword for Strings
> ------------------------------
>
> Key: GROOVY-2456
> URL: https://issues.apache.org/jira/browse/GROOVY-2456
> Project: Groovy
> Issue Type: New Feature
> Components: groovy-jdk
> Affects Versions: 1.5.1
> Reporter: Paul King
> Priority: Major
> Labels: breaking, breaking_change
> Attachments: deliveryreport.txt
>
>
> assert 'abc'.contains('a') //1
> assert 'a' in ('abc'as List) //2
> assert 'a' in 'abc' //3 this breaks
> You ask a string if a substring is contained in it (//1). You can do that
> with the in-Keyword with Lists (//2), too. But you can't do this with the
> in-Keyword with Strings. It would be a consistent behaviour from Groovy if
> you could do //3.
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