add 数学-杂项

assets/custom.js → assets/custom1.js

@@ -136,8 +136,8 @@ var initAll = function () {
     script.src = "https://giscus.app/client.js";
     script.async = true;
     script.crossOrigin = "anonymous";
-    script.setAttribute("data-repo", "sunface/rust-cookbook");
-    script.setAttribute("data-repo-id", "R_kgDOHH0skA=");
+    script.setAttribute("data-repo", "studyrs/rusty-book");
+    script.setAttribute("data-repo-id", "R_kgDOGmKA_Q");
     script.setAttribute("data-category", "giscus");
     script.setAttribute("data-category-id", "DIC_kwDOHH0skM4COa8c");
     script.setAttribute("data-mapping", "specific");

book.toml

@@ -7,7 +7,7 @@ src = "src"
 [output.html]
 no-section-label = true
 additional-css = ["theme/style1.css"]
-additional-js = ["assets/custom.js", "assets/bigPicture.js"]
+additional-js = ["assets/custom1.js", "assets/bigPicture.js"]
 git-repository-url = "https://github.com/studyrs/rusty-book"
 edit-url-template = "https://github.com/studyrs/rusty-book/edit/main/{path}"
 

src/SUMMARY.md

@@ -85,3 +85,7 @@
 - [网络协议]()
   - [TCP/IP](protocols/tcpip.md)
 
+- [文本处理]()
+  - [正则表达式](text/regex.md)
+  - [字符串解析](text/string.md)
+

src/algos/math/misc.md

@@ -1 +1,24 @@
 # 杂项
+
+### 大整数 Big int
+使用 [BitInt](https://docs.rs/num/0.2.0/num/struct.BigInt.html) 可以对超过 128bit  的整数进行计算。
+
+```rust,editable
+use num::bigint::{BigInt, ToBigInt};
+
+fn factorial(x: i32) -> BigInt {
+    if let Some(mut factorial) = 1.to_bigint() {
+        for i in 1..=x {
+            factorial = factorial * i;
+        }
+        factorial
+    }
+    else {
+        panic!("Failed to calculate factorial!");
+    }
+}
+
+fn main() {
+    println!("{}! equals {}", 100, factorial(100));
+}
+```

src/text/regex.md

@@ -0,0 +1 @@
+# 正则表达式

src/text/string.md

@@ -0,0 +1 @@
+# 字符串解析