Regular Expressions 101

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HSL(A) Color Matching

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3

Regular Expression
pcre

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(?(DEFINE) (?<decimal>(?(int)([.][0-9]+)?|[.][0-9]+)) (?<percentage> (100| (?<int>([0-9]|[1-9][0-9]))? # Have integer be optional (0-100 only) (?P>decimal) # Have decimal required when an integer is not included ) (?<symbol>%) ) (?<hue> (?<int>36[0]|3[0-5][0-9]|[12][0-9][0-9]|[1-9]?[0-9])? # Have integer be optional (?P>decimal) # Have decimal required when an integer is not included (?<symbol>\s*deg\s*)? ) (?<alpha> (?(alpha),\s*( 1[.]0| (?<int>0)? # Have integer be optional (?P>decimal) # Have decimal required when integer is not incldue )\s*) ) (?<hsl>\s*(?P>hue)\s*,\s*(?P>percentage)\s*,\s*(?P>percentage)\s*) ) hsl(?<alpha>a)?\((?P>hsl)(?P>alpha)\)
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gxJi

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Submitted by anonymous - 3 years ago