How to replace the shortest match of a string?
Sed doesn’t support non-greedy quantifiers, but perl does. Another way which may or may not match your data would be to reject parentheses in the table name and colum settings. A more elaborate method would be to first replace the first where by a unique marker, then make your replacement, and finally turn back the marker into where.
When to use regex for pattern matching in Python?
Following regex is used in Python to match a string of three numbers, a hyphen, three more numbers, another hyphen, and four numbers. Regular expressions can be much more sophisticated. For example, adding a 3 in curly brackets ( {3}) after a pattern is like saying, “ Match this pattern three times.”.
Can a pattern always match the longest possible match?
This means that a pattern always matches the longest possible match. You must do a non-greedy search but i think sed doesn’t support non-greedy searches. Therefore you must add a pivot point (s) to your search pattern so that sed finds the shortest possible match.
How to replace a substring in Microsoft Word?
The $ number language element includes the last substring matched by the number capturing group in the replacement string, where number is the index of the capturing group. For example, the replacement pattern $1 indicates that the matched substring is to be replaced by the first captured group.
Can a regex match all lines of a string?
In the context of use within languages, regular expressions act on strings, not lines. So you should be able to use the regex normally, assuming that the input string has multiple lines. In this case, the given regex will match the entire string, since ” ” is present.
How to find the shortest possible match in SED?
Therefore you must add a pivot point (s) to your search pattern so that sed finds the shortest possible match. The following line tries to emulate non-greedy matching for your special case and it’s not demanding universality, since a single w between update and the first where makes the pattern invalid: