How to convert Pascal Case with Numbers to a sentence?

Question

I am trying to convert a Pascal Case string with numbers to a sentence:

OpenHouse2StartTimestamp = > Open House 2 Start Timestamp

I've been able to use regex to separate them without numbers, thanks to this answer, but how to do so when numbers are present is eluding me:

string sentence = Regex.Replace(label, "[a-z][A-Z]", m => m.Value[0] + " " + m.Value[1]);

How can I add numbers into the mix?

https://stackoverflow.com/questions/14946933/add-spacing-between-lowercase-and-uppercase — mjwills, Dec 16 '20 at 23:06

score 2 · Accepted Answer · answered Dec 16 '20 at 23:04

You can use

var sentence = Regex.Replace(label, @"(?<=[a-z])(?=[A-Z])|(?<=\d)(?=\D)|(?<=\D)(?=\d)", " ");

See the .NET regex demo. The regex matches:

(?<=[a-z])(?=[A-Z])| - a location between a lower- and an uppercase ASCII letters, or
(?<=\d)(?=\D)| - a location between a digit and a non-digit, or
(?<=\D)(?=\d) - a location between a non-digit and a digit.

Since all you need is inserting a space at the positions matched, you do not need a Match evaluator, just use a string replacement pattern.

Thank you for the explainer. Makes sense now that I see it. – AngryHacker Dec 16 '20 at 23:08 — AngryHacker, Dec 16 '20 at 23:08

1 Answers1