Read #[validate(...)] attributes

schemars_derive/src/regex_syntax.rs

@@ -0,0 +1,26 @@
+// Copied from regex_syntax crate to avoid pulling in the whole crate just for a utility function
+// https://github.com/rust-lang/regex/blob/ff283badce21dcebd581909d38b81f2c8c9bfb54/regex-syntax/src/lib.rs
+
+pub fn escape(text: &str) -> String {
+    let mut quoted = String::new();
+    escape_into(text, &mut quoted);
+    quoted
+}
+
+fn escape_into(text: &str, buf: &mut String) {
+    buf.reserve(text.len());
+    for c in text.chars() {
+        if is_meta_character(c) {
+            buf.push('\\');
+        }
+        buf.push(c);
+    }
+}
+
+fn is_meta_character(c: char) -> bool {
+    match c {
+        '\\' | '.' | '+' | '*' | '?' | '(' | ')' | '|' | '[' | ']' | '{' | '}' | '^' | '$'
+        | '#' | '&' | '-' | '~' => true,
+        _ => false,
+    }
+}