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p11 Shorthand for any character is .
#!/bin/sh
: "Shorthand for any character
Remember that metacharacters are different inside and outside a class
[-./] more precise, [.] not the same as .
"
A='19/03/2022'
B='19-03-2022'
C='1910312022'
echo $A | grep '19[-./]03[-./]2022' -o | tee result.txt
echo $B | grep '19[-./]03[-./]2022' -o | tee result.txt -a
echo $C | grep '19.03.2022' -o | tee result.txt -a
19/03/2022
19-03-2022
1910312022
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