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I am understanding that the function takes three parameters, and understand what they are.. but I can’t figure out how to say – Start here . take data . end here.
Is this found in the regex? Or am I way off?
Yes, where to start and stop parsing the data is a detail of the regular expression itself. You can control such processing using the character sets and repetition characters (i.e. + to match 1 or more occurrence, * for 0 or more occurrences etc) Additionally, you have the ^ character to specify the start of a line and the $ character to signify the end of the line.