Purpose

This pattern is used to parse human readable text strings regarding file sizes.

The pattern names four capture groups in the string for the following purposes:

• pre: any text before the numeric characters begin are captured and filtered out
• num: matches any real number with or without a decimal point. ex: [1.3, 0.19, .6, 21., 42]
• sp: captures whitespace between numeric characters and units
• units: captures alpha text to match with units resolver

The "pre" and "sp" captures can be discarded. The num capture can be changed to numeric with a parseFloat. The units capture can be used to determine any unit conversions required.