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Kovid Goyal 2010-09-27 11:43:06 -06:00
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src/calibre/manual/regexp.rst
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@ -8,8 +8,9 @@ All about using regular expressions in |app|
Regular expressions are features used in many places in |app| to perform sophisticated manipulation of ebook content and metadata. This tutorial is a gentle introduction to getting you started with using regular expressions in |app|. Regular expressions are features used in many places in |app| to perform sophisticated manipulation of ebook content and metadata. This tutorial is a gentle introduction to getting you started with using regular expressions in |app|.
.. toctree:: .. contents:: Contents
:maxdepth: 2 :depth: 2
:local:
First, a word of warning and a word of courage First, a word of warning and a word of courage
@ -80,7 +81,7 @@ You missed...
... wait just a minute, there's one last, really neat thing you can do with groups. If you have a group that you previously matched, you can use references to that group later in the expression: Groups are numbered starting with 1, and you reference them by escaping the number of the group you want to reference, thus, the fifth group would be referenced as ``\5``. So, if you searched for ``([^ ]+) \1`` in the string "Test Test", you'd match the whole string! ... wait just a minute, there's one last, really neat thing you can do with groups. If you have a group that you previously matched, you can use references to that group later in the expression: Groups are numbered starting with 1, and you reference them by escaping the number of the group you want to reference, thus, the fifth group would be referenced as ``\5``. So, if you searched for ``([^ ]+) \1`` in the string "Test Test", you'd match the whole string!
You missed something. In the beginning, you said there was a way to make a regular expression case insensitive? In the beginning, you said there was a way to make a regular expression case insensitive?
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Yes, I did, thanks for paying attention and reminding me. You can tell |app| how you want certain things handled by using something called flags. You include flags in your expression by using the special construct ``(?flags go here)`` where, obviously, you'd replace "flags go here" with the specific flags you want. For ignoring case, the flag is ``i``, thus you include ``(?i)`` in your expression. Thus, ``test(?i)`` would match "Test", "tEst", "TEst" and any case variation you could think of. Yes, I did, thanks for paying attention and reminding me. You can tell |app| how you want certain things handled by using something called flags. You include flags in your expression by using the special construct ``(?flags go here)`` where, obviously, you'd replace "flags go here" with the specific flags you want. For ignoring case, the flag is ``i``, thus you include ``(?i)`` in your expression. Thus, ``test(?i)`` would match "Test", "tEst", "TEst" and any case variation you could think of.