12.40 FontSizeSyntax

[patterns]

[+-]?((\d[\d,]*(\.\d*)?)|((\d[\d,]*)?\.\d+))([eE][+-]?\d+)? (\s*(PX|IN|CM|PT))?

A decimal floating point number, optionally followed by either ‘in’, ‘cm’, ‘pt’, or ‘px’

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