Translations:Using regular expressions/143/en
From LimeSurvey Manual
Number validation with thousand separator
Space as separator, no minus
/^(?!0)\d{1,3}(\ \d{3})*$/
Dot as separator, minus allowed
/^-?(?!0)\d{1,3}(\.\d{3})*$/
Space as separator, no minus
/^(?!0)\d{1,3}(\ \d{3})*$/
Dot as separator, minus allowed
/^-?(?!0)\d{1,3}(\.\d{3})*$/