What is "[+]" in xemacs regular expression?

Question

In (my) XEmacs 21.4, describe-variable for gdb-prompt-pattern gives:

Value: "^>\\|^(.*gdb[+]?) *\\|^---Type <return> to.*--- *"

What is the "[+]" in there? Does it just mean "the + character"? If so, why not use "\+"?

score 3 · Answer 1 · answered Jul 27 '12 at 19:14

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In your context, [+] is the same as \+, that is matching the + character, and I imagine the original writer of that regexp either did so for readability reasons, or perhaps because [+] used to be in the past some set of chars like [-+]

answered Jul 27 '12 at 19:14

Basile Starynkevitch

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score 1 · Answer 2 · answered Jul 27 '12 at 19:13

1

in regular expression [+] is symbol +

any symbol in [] is symbol except -

answered Jul 27 '12 at 19:13

burning_LEGION

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Not exactly the regexp `[0-9]` should match any digit, not the set of three char `0` or `-` or `9`, and `[^0-9]` should match any non-digit char. – Basile Starynkevitch Jul 27 '12 at 19:16

What is "[+]" in xemacs regular expression?

2 Answers2