1 unstable release
0.1.0 | Sep 1, 2022 |
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#91 in #scan
13KB
161 lines
numscan
Experimental utility to extract numbers from strings. Requires nightly.
lib.rs
:
numscan
A library to scan for numbers in text.
- A number must have a digit in it.
- A number may have a minus (-) prefix.
- A number may contain digits, dots, and comma.
- A number ends on the first non-numeric character it finds or second dot, and never on comma or dot.
- The library only looks for ASCII digits (in contrast to Arabic numerals etc.)
- Comma separators can be used liberally, they're mostly ignored.
Examples
use numscan::NumberScanner;
let input = "1.9 - (-1.7) + 1,000 is 1,000.2.";
let output = NumberScanner::from(input).collect::<Vec<_>>();
assert_eq!(
output,
[
0..3, // "1.9"
7..11, // "-1.7"
15..20, // "1,000"
24..31, // "1,000.2"
]
);
Tip: Parsing
The library returns ranges which you can use for indexing the numbers. In the likely scenario you want to parse them as numbers, keep in mind:
- You might want to use a decimal library, if precision matters at all.
- The strings might contain commas which your number type's parsing function is likely to not accept, so you might want to remove them before attempting to parse.
Dependencies
~29KB