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what is @"\m()" means in regexp?
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renshijun
#1 Posted : Tuesday, January 3, 2017 2:05:53 AM(UTC)
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as the topic says,no explaination in manual and lib reference.
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absence
#2 Posted : Monday, January 16, 2017 10:58:50 PM(UTC)
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renshijun wrote:
as the topic says,no explaination in manual and lib reference.


Hmmm. Unsure.
I know this from TCL only, where \m matches beginning of a word boundary (like \< in posix). Not sure if sqstdlib supports that, never had the need. A quick glance at the stdlib sourcecode: I highly doubt it does. More likely it either wouldn't compile or exactly match the string \m itself.

note that the @ in squirrel simply starts a literal string, so the \ character is no escape but taken as is, so the expression string will exactly read \m()

Where did you get that expression?
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gcgcgc
#3 Posted : Saturday, January 21, 2017 1:00:36 PM(UTC)
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Looking at the source, it looks like \m takes the following two characters as an argument - '(' and ')' in this case;
It then matches the shortest sequence of characters, beginning with the first character and ending with the second but with anything in between, where there is a balanced number of both characters.
ie "(xyz)" is balanced, as is "((x(y)z))" but "((x)" is not, because the first opening "(" is not matched. For "(a)(b)" only the first "(a)" would be matched etc.
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absence
#4 Posted : Sunday, January 22, 2017 12:56:06 PM(UTC)
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Must have overlooked that, sorry. Seems like something a compiler or debugger would use to fetch expressions.
I think it should either get documented or maybe even removed from sqstdlib since it has quite some footprint for a quite specialized non-standard task. Though, I find it quite useful.
Alberto?

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