Revisions to How to check if input string matches a specific format?

semi-gratuitous spell-check of the variable name

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edited Feb 8, 2018 at 12:00

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The lazy way is just to run

if [[ $mac_adress$mac_address == ??:??:??:??:??:?? ]]; then echo Heureka; fi

but this doesn't check whether it's a hex string. So if this is important

if [[ $mac_adress$mac_address =~ ^[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]$ ]]; then echo Heureka; fi

might be better. The later can be shortened to

if [[ $mac_adress$mac_address =~ ^([[:xdigit:]]{2}:){5}[[:xdigit:]]{2}$ ]]; then
    echo Heureka; 
fi

If the pattern matches I don't see a need to check for the correct length as well.

The lazy way is just to run

if [[ $mac_adress == ??:??:??:??:??:?? ]]; then echo Heureka; fi

but this doesn't check whether it's a hex string. So if this is important

if [[ $mac_adress =~ ^[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]$ ]]; then echo Heureka; fi

might be better. The later can be shortened to

if [[ $mac_adress =~ ^([[:xdigit:]]{2}:){5}[[:xdigit:]]{2}$ ]]; then
    echo Heureka; 
fi

If the pattern matches I don't see a need to check for the correct length as well.

The lazy way is just to run

if [[ $mac_address == ??:??:??:??:??:?? ]]; then echo Heureka; fi

but this doesn't check whether it's a hex string. So if this is important

if [[ $mac_address =~ ^[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]$ ]]; then echo Heureka; fi

might be better. The later can be shortened to

if [[ $mac_address =~ ^([[:xdigit:]]{2}:){5}[[:xdigit:]]{2}$ ]]; then
    echo Heureka; 
fi

If the pattern matches I don't see a need to check for the correct length as well.

I don't think those parenthesis are required

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edited Jan 8, 2018 at 22:19

ilkkachu

148.1k
16
268
441

The lazy way is just to run

if [[ $mac_adress == ??:??:??:??:??:?? ]]; then echo Heureka; fi

but this doesn't check whether it's a hex string. So if this is important

if [[ $mac_adress =~ ^[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]$ ]]; then echo Heureka; fi

might be better. The later can be shortendshortened to

if [[ $mac_adress =~ ^(([[:xdigit:]]){2}:){5}([[:xdigit:]]){2}$ ]]; then
    echo Heureka; 
fi

If the pattern matches I don't see a need to check for the correct length as well.

The lazy way is just to run

if [[ $mac_adress == ??:??:??:??:??:?? ]]; then echo Heureka; fi

but this doesn't check whether it's a hex string. So if this is important

if [[ $mac_adress =~ ^[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]$ ]]; then echo Heureka; fi

might be better. The later can be shortend to

if [[ $mac_adress =~ ^(([[:xdigit:]]){2}:){5}([[:xdigit:]]){2}$ ]]; then
    echo Heureka; 
fi

If the pattern matches I don't see a need to check for the correct length as well.

The lazy way is just to run

if [[ $mac_adress == ??:??:??:??:??:?? ]]; then echo Heureka; fi

but this doesn't check whether it's a hex string. So if this is important

if [[ $mac_adress =~ ^[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]$ ]]; then echo Heureka; fi

might be better. The later can be shortened to

if [[ $mac_adress =~ ^([[:xdigit:]]{2}:){5}[[:xdigit:]]{2}$ ]]; then
    echo Heureka; 
fi

If the pattern matches I don't see a need to check for the correct length as well.

added 2 characters in body

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edited Jan 8, 2018 at 19:12

nohillside

3.3k
20
27

The lazy way is just to run

if [[ $mac_adress == ??:??:??:??:??:?? ]]; then echo Heureka; fi

but this doesn't check whether it's a hex string. So if this is important

if [[ $mac_adress =~ [0^[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]F]$ ]]; then echo Heureka; fi

might be better. The later can be shortend to

if [[ $mac_adress =~ ^(([0-9a-fA-F][[:xdigit:]]){2}:){5}([0-9a-fA-F][[:xdigit:]]){2}$ ]]; then
    echo Heureka; 
fi

If the pattern matches I don't see a need to check for the correct length as well.

The lazy way is just to run

if [[ $mac_adress == ??:??:??:??:??:?? ]]; then echo Heureka; fi

but this doesn't check whether it's a hex string. So if this is important

if [[ $mac_adress =~ [0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F] ]]; then echo Heureka; fi

might be better. The later can be shortend to

if [[ $mac_adress =~ (([0-9a-fA-F]){2}:){5}([0-9a-fA-F]){2} ]]; then
    echo Heureka; 
fi

If the pattern matches I don't see a need to check for the correct length as well.

The lazy way is just to run

if [[ $mac_adress == ??:??:??:??:??:?? ]]; then echo Heureka; fi

but this doesn't check whether it's a hex string. So if this is important

if [[ $mac_adress =~ ^[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]$ ]]; then echo Heureka; fi

might be better. The later can be shortend to

if [[ $mac_adress =~ ^(([[:xdigit:]]){2}:){5}([[:xdigit:]]){2}$ ]]; then
    echo Heureka; 
fi

If the pattern matches I don't see a need to check for the correct length as well.

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answered Jan 8, 2018 at 18:58

nohillside

3.3k
20
27

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