operators - =~ 在 VimScript 中是什么意思？

Question

我一生都无法在谷歌或这里或帮助文件中找到答案。

if "test.c" =~ "\.c"

一开始我以为 =~ mean 结束，但观察这些结果:

Command                               Result
echo "test.c" =~ "\.c"                1
echo "test.c" =~ "\.pc"               0
echo "test.pc" =~ "\.c"               1
echo "testc" =~ "\.c"                 1
echo "ctest" =~ "\.c"                 1
echo "ctestp" =~ "\.pc"               0
echo "pctestp" =~ "\.pc"              0
echo ".pctestp" =~ "\.pc"             0

一个解释会很棒。一个指向试图破译 VimScript 的站点的链接会更好。

Answer 1

From the Vim documentation ，它在左侧进行右侧操作数(作为模式)的模式匹配。

For strings there are two more items:

    a =~ b      matches with
    a !~ b      does not match with

The left item "a" is used as a string. The right item "b" is used as a pattern, like what's used for searching. Example:

    :if str =~ " "
    :  echo "str contains a space"
    :endif
    :if str !~ '\.$'
    :  echo "str does not end in a full stop"
    :endif

您可以再次尝试您的测试用例。例如，我与您的不一致:

echo ".pctestp" =~ "\.pc"             1

双引号与单引号似乎会影响反斜杠的解释方式:

echo "test.pc" =~ "\.c"               1
echo "test.pc" =~ '\.c'               0