Ruby String Scanner

Scan is a stringscanner class method which tries to match with pattern at the current position.

Ruby string scanner.

Scanning a string means remembering the position of a scan pointer which is just an index. You can look ahead in the string without actually scanning. Ruby regular expressions ruby regex for short help you find specific patterns inside strings with the intent of extracting data for further processing two common use cases for regular expressions include validation parsing. Advances the scan pointer if advance pointer p otherwise not.

Advancing the scan pointer. Scans the string until the pattern is matched. Think about an email address with a ruby regex you can define what a valid email address looks like. Returns the matched string if return string p is true otherwise returns the number of bytes advanced.

Returns the matched string if return string p is true otherwise returns the number of bytes advanced. This method does affect the match register. Scans the string until the pattern is matched. You can access the most recent match.

You can modify the string being scanned reset or terminate the scanner find out or change the position of the scan pointer skip ahead and so on. Usually immediately after it. Advances the scan pointer if advance pointer p otherwise not. This method does affect the match register.

Given the string test string here are the pertinent scan pointer positions.