I am just curious if this regex expression will be able to be shorten. it should allow ten digits.

/^(?!0 (?:\.0 )?$)(\d{1,2}\.\d{1,10}|\d{1,2}|(100)|(100\\.00)|(100\\.0000000000)|(100\\.000000000)|(100\\.00000000)|(100\\.0000000)|(100\\.000000)|(100\\.00000)|(100\\.0000)|(100\\.0000)|(100\\.000)|(100\\.0))$/

CodePudding user response：

You need to use

/^(?![0.] $)(?:\d{1,2}(?:\.\d{1,10})?|100(?:\.0{1,10})?)$/

See the regex demo.

Details:

• ^ - start of string
• (?![0.] $) - no only 0 and/or . chars till end of string are allowed
• (?: - either of
  • \d{1,2}(?:\.\d{1,10})? - one or two digits and then an optional occurrence of a . and one to ten digits
• | - or
  • 100(?:\.0{1,10})? - 100 and then an optional occurrence of a . and one to ten 0 chars
• ) - end of the group
• $ - end of string.