[issue28293] Don't completely dump the regex cache when full

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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components: +Regular Expressions
nosy: +ezio.melotti, mrabarnett

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28293>
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