regular expression in iOS

Question

I am looking for a regular expression to match the following -100..100:0.01. The meaning of this expression is that the value can increment by 0.01 and should b

Answer 1

(\b|-)(100(\.0+)?|[1-9]?[0-9](\.[0-9]{1,2})?\b

Explanation:

(\b|-)      # word boundary or -
(           # Either match
 100        #  100
 (\.0+)?    #  optionally followed by .00....
|           # or match
 [1-9]?     #  optional "tens" digit
 [0-9]      #  required "ones" digit
 (          #  Try to match
  \.        #   a dot
  [0-9]{1,2}#   followed by one or two digits
 )?         #   all of this optionally
)           # End of alternation
\b          # Match a word boundary (make sure the number stops here).