Description
Return inclusive start and end, requiring start<=end<=U+10FFFF.
CSS token notation separates numeric values, units, Unicode ranges, and color channels. Code-point intervals differ from Unicode scalar validity, while RGB channel bytes and alpha use different scales. A token decoder can return components without parsing a stylesheet or checking all CSS semantics.
Return inclusive start and end, requiring start<=end<=U+10FFFF.
When to use this tool
Use Css Unicode Range Single Interval when you need the components of the supported CSS color, range, or dimension token.
How to use the tool and how it works
- Enter token. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read start, end. Use the output convention below.
Accept a case-insensitive U+ prefix with 1-6 hex digits and an optional hyphenated second value. Return inclusive start and end, requiring start<=end<=U+10FFFF.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| token | Complete literal token in the grammar stated above. | Required. Text; maximum UTF-16 length 8192. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| start | Inclusive numeric range start; no surrogate exclusion is applied. | Required. Safe integer. |
| end | End | Required. Safe integer. |
{
"input": {
"token": "U+0041-005A"
},
"output": {
"start": 65,
"end": 90
}
}Limitations and assumptions
- Surrogate numeric values are not excluded. Wildcards and surrounding CSS syntax are unsupported; parsing a range does not establish Unicode scalar validity, assigned characters, or font support.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
Alternative or Complementary methods
Use a CSS parser for escapes, identifiers, token boundaries, and complete stylesheet grammar. Apply appropriate color or Unicode interpretation only after checking the intended value model.
References
Similar or alternative tools
- Css Unicode Range Wildcard Token
Expand a CSS wildcard Unicode-range token into inclusive numeric bounds.
- Css Dimension Number Unit Split
Match a signed integer or decimal number with optional exponent followed by an ASCII letter and further letters, digits, or hyphens.