Does this regex mean it has to start with A, end with Z?
re.search("\A[0-9A-Za-z_-]+\Z", sometext)
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69answers:
3
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A:
No, those are anchors.
\A means start of string, and \Z means end of string. Similarly ^ means start of line and $ means end of line.
See the documentation for the re module.
\A - Matches only at the start of the string.
\Z - Matches only at the end of the string.
Mark Byers
2010-08-19 18:04:56
oh so \A == ^ and \Z == $
Blankman
2010-08-19 18:10:39
@Blankman: They are equivalent if the input string is a single line.
Mark Byers
2010-08-19 18:14:20
Not quite: **^** signifies the start of a *line*, while **$** signifies its end.
FK82
2010-08-19 18:14:47
Not necessarily - "start of string" and "start of line" may not be equivalent - `'Line one \nLine two'`
nearlymonolith
2010-08-19 18:19:42
A:
What is "it"?
If you're talking about a string. Yes, it does: \A means beginning of a string , \Z means end of a string.
If you are talking about a line (inside a string), you will have to insert boundary operators:
"^[0-9A-Za-z_-]+$"
^ ("caret") specifies beginning of a line; *$ ("dollar sign") specifies the end of a line.
If you are talking about a word: no, it does not; you did not specify start or end of a word.
FK82
2010-08-19 18:08:04
A:
Just remove the '\' and you will get what you want.
"^A[0-9A-Za-z_-]+Z$"
Klark
2010-08-19 18:14:15