Regex: support duplicated named captures #5061
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makenowjust
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Current crystal compiler cannot compile regexp containing duplicated named captures, so CI is failed. Should I replace regexp literal to |
makenowjust
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I should fix this document also. |
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#5061 (comment) I want some opinion to this. /cc @asterite @mverzilli @RX14 |
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Yeah, using |
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@RX14 fixed this. |
RX14
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Oct 7, 2017
asterite
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Oct 13, 2017
src/regex/match_data.cr
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| private def named_capture_number(group_name) | ||
| first = Pointer(UInt8).null | ||
| last = Pointer(UInt8).null | ||
| name_entry_size = LibPCRE.get_stringtable_entries(@code, group_name, pointerof(first), pointerof(last)) |
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can out first, out last be used here?
asterite
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Oct 13, 2017
oprypin
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Oct 13, 2017
src/regex/match_data.cr
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| @@ -157,10 +157,24 @@ class Regex | |||
| # "Crystal".match(/r(?<ok>ys)/).not_nil!["ok"]? # => "ys" | |||
| # "Crystal".match(/r(?<ok>ys)/).not_nil!["ng"]? # => nil | |||
| # ``` | |||
| # | |||
| # When there are capture groups having same name, it returns the lastest | |||
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Should be "last". There is another place where this should be changed.
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Currently we cannot use duplicated named captures by default:
But we can use
(?J)for this:Unfortunately,
Regex::MatchDatadoes not support duplicated named captures, so this code is broken:This PR fixes
Regex::MatchDatato support duplicated named captures, andRegexpaccepts duplicated named captures by default. Duplicated named captures are useful when writing complex regexp. Thank you.