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Count number of matches of a regex in Javascript
... || []).length; // 0
(('a a a').match(/a/g) || []).length; // 3
Based on https://stackoverflow.com/a/48195124/16777 but fixed to actually work in zero-results case.
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How to use MySQL DECIMAL?
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What happens if you call erase() on a map element while iterating from begin to end?
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Formula to determine brightness of RGB color
...Luminance (relative)
0.2126 * R + 0.7152 * G + 0.0722 * B
2nd picture - http://www.w3.org/TR/AERT#color-contrast
0.299 * R + 0.587 * G + 0.114 * B
3rd picture - HSP Color Model
sqrt(0.299 * R^2 + 0.587 * G^2 + 0.114 * B^2)
4th picture - WCAG 2.0 SC 1.4.3 relative luminance and contrast rat...
Compare DATETIME and DATE ignoring time portion
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Case statement with multiple values in each 'when' block
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Python - abs vs fabs
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if, elif, else statement issues in Bash
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SQL how to increase or decrease one for a int column in one command
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Best way to find the intersection of multiple sets?
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