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Regex for dimensions (length x width x height)

ZachBodenner

Hello,

I'm looking for a regex expression that would restrict a text entry to length x width x height style dimensions. Ideally, no limits to the number of digits available in the number part of the dimensions, x can be either lower or upper case.

Not super well versed in regex. I've managed to find good expressions from ESRI to get regex for email input to work , but I'm struggling with this one. I've used this stack overflow threat as reference but none have been successful:

https://stackoverflow.com/questions/39452200/match-product-dimensions-with-regular-expression

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Accepted answers

JamesTedrick

Hi @ZachBodenner ,

The basic pattern you're looking for has the following components in sequence:

Some amount of number characters (at least 1 character and possibly with the appropriate decimal separator for you region)
' x ', where the spaces may be optional
More number characers
Another ' x '
More number characters

Each of those parts has a corresponding part of the overall regex pattern. I'm going to assume a period (.) is the appropriate decimal separator in the example below:

A decimal number: (\d+\.?\d*)
1. ( ) group everything together
2. \d is a digit character
3. + is used to match 1 or more numeric characters
4. \. matches a period (which is a special character in regex and needs the \ to make it match as a character)
5. ? is used to match 0 or 1 instance of the period (so 2 periods in a row will fail the match)
6. \d matches number characters (the decimal portion)
7. * matches 0 or more numeric characters (so that integers without decimals are supported)
' x ': (\s?x\s?)
1. ( ) groups everything together
2. \s matches a white space character (like space)
3. ? is used to match 0 or 1 instance of the white space character (so 2 spaces in a row will fail the match)
4. x is the character 'x'

Placing them together to get:

(\d+\.?\d*)(\s?x\s?)(\d+\.?\d*)(\s?x\s?)(\d+\.?\d*)

All comments

ZachBodenner

Update: it worked when I structured it this way:

regex(., '^(\d+\.?\d*)(\s?x\s?)(\d+\.?\d*)(\s?x\s?)(\d+\.?\d*)')

I used the email regex formatting as reference and added (.,'^ to the beggining.

Sidenote, what would my syntax be if I wanted the "x" to be either caps or lower case? The current format seems to mandate lower case.

ZachBodenner

Hey, this is great, that explanation is so helpful! The only problem is that Survey123 Connect is giving me the below error:

Here's the xls form with the regex in the constraint column:

JamesTedrick

Hi @ZachBodenner ,

The basic pattern you're looking for has the following components in sequence:

Some amount of number characters (at least 1 character and possibly with the appropriate decimal separator for you region)
' x ', where the spaces may be optional
More number characers
Another ' x '
More number characters

Each of those parts has a corresponding part of the overall regex pattern. I'm going to assume a period (.) is the appropriate decimal separator in the example below:

A decimal number: (\d+\.?\d*)
1. ( ) group everything together
2. \d is a digit character
3. + is used to match 1 or more numeric characters
4. \. matches a period (which is a special character in regex and needs the \ to make it match as a character)
5. ? is used to match 0 or 1 instance of the period (so 2 periods in a row will fail the match)
6. \d matches number characters (the decimal portion)
7. * matches 0 or more numeric characters (so that integers without decimals are supported)
' x ': (\s?x\s?)
1. ( ) groups everything together
2. \s matches a white space character (like space)
3. ? is used to match 0 or 1 instance of the white space character (so 2 spaces in a row will fail the match)
4. x is the character 'x'

Placing them together to get:

(\d+\.?\d*)(\s?x\s?)(\d+\.?\d*)(\s?x\s?)(\d+\.?\d*)

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