正则表达式命名为Capture Group的替代方案，前导$字符

Question

I have two groups web and var, with the following alternative strings: aliceblue, yellow and $aliceblue, $yellow

I am able to get matches for aliceblue and yellow in group web but i am not getting matches for $aliceblue or $yellow in group var.

re = '/(?x)(?i)(?<![@#$.\-_])(?:\b(?P<var>$aliceblue|$yellow)\b(?!\()|\b(?P<web>aliceblue|yellow)\b(?!\())(?![@#$.\-_])/m';
str = 'aliceblue';

I tried to escape the $ character without success

re = '/(?x)(?i)(?<![@#$.\-_])(?:\b(?P<var>\$aliceblue|\$yellow)\b(?!\()|\b(?P<web>aliceblue|yellow)\b(?!\())(?![@#$.\-_])/m';
str = '$aliceblue';

How can I change the regex so I get a match for $aliceblue in group var and aliceblue in group web?

Answer 1

Besides escaping the $ in your regex, you also need to get rid of \\b just before it, as $ is not part of word character \\w which is [a-zA-Z0-9_]

Check this demo with \\b removed from your regex