regex,python-2.7,regex-lookarounds , lookbehind for start of string or a character


lookbehind for start of string or a character

Question:

Tag: regex,python-2.7,regex-lookarounds

The command

re.compile(ur"(?<=,| |^)(?:next to|near|beside|opp).+?(?=,|$)", re.IGNORECASE)

throws a

sre_constants.error: look-behind requires fixed-width pattern

error in my program but regex101 shows it to be fine.

What I'm trying to do here is to match landmarks from addresses (each address is in a separate string) like:

The lookbehind is to avoid matching words with opp in them (like in string 3).

Why is that error thrown? Is there an alternative to what I'm looking for?


Answer:
re.compile(ur"(?:^|(?<=[, ]))(?:next to|near|beside|opp).+?(?=,|$)", re.IGNORECASE)

You can club 3 conditions using [] and |.See demo.

https://regex101.com/r/vA8cB3/2#python


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