matches any character EXCEPT an uppercase letter. dg matches any d.g string ("d", then any character, then "g") except "dig", "dog" or "dug". It means "match any character EXCEPT one of these. matches any uppercase letter.Ī caret ("^") in the first position of a character class negates the class. You may use hyphens to indicate ranges of characters. The pattern dg matches "dig" or "dog" or "dug". (a|b) means an "a" or a "b".Įnclosing a list of characters in brackets means, "match exactly one of these characters." Example. ? (zero or one) the preceding character is optional.+ (one or more) \d+ is "one or more digits", a pattern that matches every positive decimal integer.Some regex characters provide a repetition factor, called a "multiplier". \D any character EXCEPT a decimal digit.The single, lowercase letters that identify special character classes may be reversed in meaning by using the uppercase letter: (If you are not sure, which is often the case, "escape" the punctuation mark-precede it with a backslash.) Whether or not they are special, if you want the mark itself, precede it with a backslash. Punctuation marks sometimes have a special meaning. \w (w stands for "word") any alphabetic (upper or lowercase), digit (0 through 9) or an underscore.\s (two characters, read as "escape s") matches any whitespace (space, tab, return or newline).a the letter "a" matches itself-most characters match just themselves.So here's a tiny regex summary (there are whole books written on the subject!) to get you started. You need to change the fixed part but preserve the variable part. You have some text to find, part of which is fixed and part of which is variable. in XHTML, they are mandatory.) A simple Find/Replace would do the trick, but you've also got width=60px and lots of other widths. You want that upgraded to an XHTML compatible attribute width='120px'. The "Find" part of a Find/Replace dialog is one simple example. Regular expressions are used for matching string patterns. If you've never used regex before, we won't teach you too much in this one short page, but we'll get you started with a basic use. One of the great features of programmer's editor Notepad++ is that it matches these old veterans' regex strengths without hiding them in a forest of cryptic commands. Git Bash relies on the PATH environment variable to find any programme we wish to execute- of course it does, that’s what programmes did in the eighties.One of the features of the great old programming editors (with legendary Unix names like Vi and Emacs) was their ability to use regular expressions (aka regex) in search and replace operations. If a user types a command without specifying the path, the operating system will search the current directory and then each of the paths listed in the PATH environment variable trying to find it. The best known Environment Variable is PATH, this contains a list of directory paths. In Windows, Environment Variables describe the computer environment within which programmes run they define common names (the name of the computer for example) and default file extensions. It was 1989, I was 23, MS-DOS was the operating system of choice, Margret Thatcher was prime minister and my children hadn’t been born- happy times.Įnvironment Variables ( can’t believe I’m talking about this-it’s like talking about my Grandmother’s mangle or outside lavatories), they still exist in Windows, though most programmes just set them up as part of the installation process or use the registry instead. I think the last time I had to do this was when I was using WordPerfect 5.1 and Lotus 123. To make Notepad++ the default text editor for Git Bash we have to adjust the Windows Environment Variable. Ok, you’ll like this it’s a trip down memory lane. Brackets and its extensions manage Git in the Brackets development environment very well. When I say Brackets doesn’t work with Git, I mean as a command line editor in Git Bash. Just to clarify I’m using Brackets as the interface to Git. Notepad++ works well with Git, some of the others (Brackets †1 for example) don’t work so well. I’m assuming you are going to use Notepad++ as the default text editor for Git Bash (this is the one I installed in § 3.2.1).
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