feat: Allow regex parsers to use regex-1.0

Enabled using the `regex-1` feature.

Cargo.toml

@@ -27,6 +27,7 @@ byteorder = "1.1.0"
 either = "1"
 unreachable = "1.0.0"
 regex = { version = "0.2.0", optional = true }
+combine-regex-1 = { version = "1", path = "combine-regex-1", optional = true }
 memchr = { version = "2", default-features = false }
 
 [dev-dependencies]
@@ -45,7 +46,9 @@ quick-error = "1.0"
 default = ["std"]
 # Run the mp4 benchmark, requires a mp4 file named `small.mp4` in the benches directory
 mp4 = []
-doc = ["regex"]
+# Enables use of regex version 1 in the regex parsers
+regex-1 = ["combine-regex-1"]
+doc = ["regex", "regex-1"]
 std = ["memchr/use_std"]
 
 [[bench]]

combine-regex-1/.gitignore

@@ -0,0 +1 @@
+target

combine-regex-1/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "combine-regex-1"
+version = "1.0.0"
+authors = ["Markus Westerlind <marwes91@gmail.com>"]
+
+license = "MIT/Apache-2.0"
+
+description = "Re-export of regex 1.0 letting combine use both 0.2 and 1.0"
+
+repository = "https://github.com/Marwes/combine"
+
+[dependencies]
+regex = { version = "1", features = ["use_std"], default-features = false }

combine-regex-1/src/lib.rs

@@ -0,0 +1,3 @@
+extern crate regex;
+
+pub use regex::*;

src/lib.rs

@@ -812,7 +812,7 @@ pub use parser::range;
     since = "3.0.0",
     note = "Please use the `parser::regex` module instead"
 )]
-#[cfg(feature = "regex")]
+#[cfg(any(feature = "regex", feature = "regex-1"))]
 pub use parser::regex;
 
 #[doc(hidden)]

src/parser/mod.rs

@@ -68,7 +68,7 @@ pub mod error;
 pub mod function;
 pub mod item;
 pub mod range;
-#[cfg(feature = "regex")]
+#[cfg(any(feature = "regex", feature = "regex-1"))]
 pub mod regex;
 pub mod repeat;
 pub mod sequence;