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The Template:Str_number/trim extracts a number at the start of parameter 1.
It takes a string as parameter, and returns the string trimmed to the beginning number if non-numeric text does not appear before the first number.
Examples
{{Str number/trim}}→{{Str number/trim|abcde}}→{{Str number/trim|abcde123}}→{{Str number/trim|123456}}→ 123456{{Str number/trim|123 456}}→ 123{{Str number/trim|123.456}}→ 123{{Str number/trim|1976–2006}}→ 1976{{Str number/trim|19/76+2006}}→ 19{{Str number/trim|19 (302)}}→ 19{{Str number/trim|1234abc}}→ 1234{{Str number/trim|1234abc56}}→ 1234{{Str number/trim|12345678901234567890}}→ 12345678901234567890{{Str number/trim|1234567890123456789012345}}→ 1234567890123456789012345{{Str number/trim| 1234567890123456789012345}}→ 1234567890123456789012345{{Str number/trim|13<ref>a reference</ref>}}→ 13{{Str number/trim|24.51 km (15.23 mi)}}→ 24