Welcome to the Onshape forum! Ask questions and join in the discussions about everything Onshape.
First time visiting? Here are some places to start: Looking for a certain topic? Check out the categories filter or use Search (upper right).
 Need support? Ask a question to our Community Support category.
 Please submit support tickets for bugs but you can request improvements in the Product Feedback category.
 Be respectful, on topic and if you see a problem, Flag it.
If you would like to contact our Community Manager personally, feel free to send a private message or an email.
Limiting decimal precision in print() with Regex
Rootentity
Member Posts: 21 ✭✭
I am working on making a simple CAM drilling feature script.
https://cad.onshape.com/documents/b571df08ddf1c4635358bf69/w/110a6ada5e5acec1cbc03228/e/fc6f2559c19db616bda0b63c
I need to limit decimal precision because many controllers, and some G code senders choke on long numbers.
I started by multiplying rounding and then dividing to trim the decimal places, but that didn't guarantee only four decimal places in every case. so now I am converting to strings and using a regular expression to trim the trailing digits off, however my expression is failing in some cases and I don't know why.
Here is the expression in question:
(?\\d*\\.\\d{1,4}^\\d$)
and Broken down:
? = optional minus sign
d* = any number of digits
.d{1,4} = a decimal place followed by one to four digits
 ^d$ = or if it's not the previous format it's just a single digit
It's failing on numbers like 0.4 with a single digit a decimal and a single digit. I am certainly no master at Regex, I can't figure out why it isn't caught by the first case?
Maybe I'm all off course and there is a simpler way to do this?
https://cad.onshape.com/documents/b571df08ddf1c4635358bf69/w/110a6ada5e5acec1cbc03228/e/fc6f2559c19db616bda0b63c
I need to limit decimal precision because many controllers, and some G code senders choke on long numbers.
I started by multiplying rounding and then dividing to trim the decimal places, but that didn't guarantee only four decimal places in every case. so now I am converting to strings and using a regular expression to trim the trailing digits off, however my expression is failing in some cases and I don't know why.
Here is the expression in question:
(?\\d*\\.\\d{1,4}^\\d$)
and Broken down:
? = optional minus sign
d* = any number of digits
.d{1,4} = a decimal place followed by one to four digits
 ^d$ = or if it's not the previous format it's just a single digit
It's failing on numbers like 0.4 with a single digit a decimal and a single digit. I am certainly no master at Regex, I can't figure out why it isn't caught by the first case?
Maybe I'm all off course and there is a simpler way to do this?
0
Best Answer

Rootentity Posts: 21 ✭✭I've solved this problem, I was using REGEX_NUMBER_CAPTURE to capture everything left over and this was causing the trouble. I've replaced the expression with this "([\\d]+\\.\\d{1,4})\\d*?" The \\d*? at the end accounts for all of the remaining digits after the needed four digits.0
Answers