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Finding Currency Values
Matching currency values in text files as they are ingested is a useful technique. Regular expressions are ideally suited to this.
Here we match a currency value with an optional pence amount:
\£[0-9]+(\.[0-9][0-9])?
The £ symbol implies this must be a Unicode string. The + operator means we must have at least 1 digit after the £. The brackets atomize the decimal point and pence value that is optional or instantiated only once because of the ? operator. We could use the bounds operator like this to mean the same thing:
\£[0-9]+(\.[0-9]{2})?
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