This Regexp tries to grep a price from a string

price-regexp.txt

// This Regexp tries to grep a price from a string.
// 1. The number must makes sense. it may contain "." or "," i.e 1 1.000,99 10,0 etc 
// 2. The String must conatin a currency identifier like EUR,USD,€ or $.
// 2a) The currency identifer may be at the begining or at the end of the matching string
// 2b) There may be a space between value and currency identifier
// This regexp is based upon http://stackoverflow.com/questions/1547574/regex-for-prices

(USD|EUR|€|\$|£)\s?(\d{1,}(?:[.,]\d{3})*(?:[.,]\d{2}))|(\d{1,3}(?:[.,]\d{3})*(?:[.,]\d{2})?)\s?(USD|EUR)

updated Version (also matches numbers without delimiters in between like $2 $34 thx PepsiX for pointing out this issue:
(USD|EUR|€|\$|£)\s?(\d{1,}(?:[.,]*\d{3})*(?:[.,]*\d*))|(\d{1,3}(?:[.,]*\d*)*(?:[.,]*\d*)?)\s?(USD|EUR)

// here is the breakdown:
// Price Number: \d{1,3}(?:[.,]\d{3})*(?:[.,]\d{2})?
// Currency Symbol: a\s?(USD|EUR|€|\$) (with optional leading space)Ω// This Regexp tries to grep a price from a string.

There is an bug in the first post. Valid regexp is:

(USD|EUR|€|\$|£)\s?(\d{1,3}(?:[.,]\d{3})*(?:[.,]\d{2})?)|(\d{1,3}(?:[.,]\d{3})*(?:[.,]\d{2})?)\s?(USD|EUR|€|\$|£)

my elymbmx2.htm have prices in them and they are like this

$9.99

I get this error
cat elymbmx2.htm | grep -o (USD|EUR|€|$|£)\s?(\d{1,3}(?:[.,]\d{3})(?:[.,]\d{2})?)|(\d{1,3}(?:[.,]\d{3})(?:[.,]\d{2})?)\s?(USD|EUR|€|$|£)
*(?:[. was unexpected at this time.