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bug#15410: [:alnum:] is not [:alpha:] AND [:digit:]... [:alnum:] is [:al
From: |
Nick Aganan |
Subject: |
bug#15410: [:alnum:] is not [:alpha:] AND [:digit:]... [:alnum:] is [:alpha:] OR [:digit:] |
Date: |
Wed, 18 Sep 2013 12:07:00 -0400 |
[:alnum:] is defined as
Alphanumeric characters: ‘[:alpha:]’ *and* ‘[:digit:]’; in the ‘C’ locale
and ASCII character encoding, this is the same as ‘[0-9A-Za-z]’.
AND = need to satisfy *BOTH* alpha and digit
OR = need to satisfy *EITHER* alpha or digit
It looks like ‘[:alpha:]’ *AND* ‘[:digit:]’ functions as ‘[:alpha:]’ *OR* ‘
[:digit:]’, See example
Example:
# cat /tmp/c
adc
x1y1z123
456
# grep [[:alpha:]] /tmp/c
adc
x1y1z123
# grep [[:digit:]] /tmp/c
x1y1z123
456
# grep [[:alnum:]] /tmp/c
adc
x1y1z123
456
### if [:alnum] functions as ‘[:alpha:]’ *AND* ‘[:digit:]’, it should show
x1y1z123 only
- bug#15410: [:alnum:] is not [:alpha:] AND [:digit:]... [:alnum:] is [:alpha:] OR [:digit:],
Nick Aganan <=