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This is the {{str number}} meta-template.
It takes a string as parameter, and returns the number of leading digits. It does not handle negative numbers or decimals, and stops at any minus sign '-' or dot '.' symbols.
If the parameter is empty or undefined, zero is returned:
{{str number}}
returns 0{{str number|}}
returns 0{{str number| }}
returns 0The count is interrupted by anything but the ten digits:
{{str number|abcde}}
returns 0{{str number|123456}}
returns 6{{str number| 123456}}
returns 6{{str number|123 456}}
returns 3{{str number|1234abc}}
returns 4{{str number|1234abc56}}
returns 4{{str number|15<ref>a reference</ref>}}
returns 2{{str number|15(15)}}
returns 2{{str number|-1234xx}}
returns 0{{str number|12.34xx}}
returns 2{{str number|12,345}}
returns 2