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Answer 1

+1 A:

^ABC[a-zA-Z0-9_]*$

adamk 2010-07-19 14:05:31

I think that the regex should have a `^` at the beginning. Otherwise it won't guarantee that the string starts with `ABC`. It would match a string such as `123ABC`.

sigint 2010-07-19 15:02:51

Changed, thanks for the comment.

adamk 2010-07-19 15:28:02

Answer 2

+3 A:

that's the whole regex:

^ABC\w+

SilentGhost 2010-07-19 14:05:50

why the downvote?

SilentGhost 2010-07-19 14:09:35

The ABC must match at the beginning of the line. This will match anywhere.

cape1232 2010-07-19 14:09:46

Not necessarily (even without the `^`) - for example, in Python `re.match()` always anchors the match at the start of the string. But I'd add a `$` at the end, or the regex will also return True on a partially matched string.

Tim Pietzcker 2010-07-19 14:34:25

@Tim: it's not clear from the question whether there is a single multi-line string given and every line should match (which with my regex would require `re.M` flag) or it's a series of string which could be matched with `re.match` (with or without the `^` anchor).

SilentGhost 2010-07-19 14:42:30

Answer 3

+3 A:

Something like this?

^ABC\w+$

LukeH 2010-07-19 14:07:12

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