JavaScript is_unicode
Returns true if variable is a unicode string
1 2 3 4 56 7 8 9 1011 12 13 14 1516 17 18 19 2021 22 23 24 2526 27 28 29 3031 | function is_unicode (vr) { // + original by: Brett Zamir (http://brett-zamir.me) // % note 1: Almost all strings in JavaScript should be Unicode // * example 1: is_unicode('We the peoples of the United Nations...!'); // * returns 1: true if (typeof vr !== 'string') { return false; } // If surrogates occur outside of high-low pairs, then this is not Unicode var arr=[], any='([\s\S])', highSurrogate='[\uD800-\uDBFF]', lowSurrogate='[\uDC00-\uDFFF]', highSurrogateBeforeAny = new RegExp(highSurrogate+any, 'g'), lowSurrogateAfterAny = new RegExp(any+lowSurrogate, 'g'), singleLowSurrogate = new RegExp('^'+lowSurrogate+'$'), singleHighSurrogate = new RegExp('^'+highSurrogate+'$'); while ((arr = highSurrogateBeforeAny.exec(vr)) !== null) { if (!arr[1] || !arr[1].match(singleLowSurrogate)) { // If high not followed by low surrogate return false; } } while ((arr = lowSurrogateAfterAny.exec(vr)) !== null) { if (!arr[1] || !arr[1].match(singleHighSurrogate)) { // If low not preceded by high surrogate return false; } } return true;} |
Examples
Running
1 | is_unicode('We the peoples of the United Nations...!'); |
Should return
1 | true |
Dependencies
No dependencies, you can use this function standalone.
Open syntax issues
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Authors
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