^0-91100-914$

This regular expression matches a decimal number with up to 10 digits before the decimal point and up to 4 digits after the decimal point.

Explanation of the regular expression:

• ^ asserts the start of the string.
• [0-9]{1,10} matches any digit from 0 to 9, with a minimum of 1 and a maximum of 10 occurrences.
• (\.[0-9]{1,4})? matches an optional decimal part.
  • \. matches the decimal point.
  • [0-9]{1,4} matches any digit from 0 to 9, with a minimum of 1 and a maximum of 4 occurrences.
  • ? makes the decimal part optional.
• $ asserts the end of the string