change default snippets.

${SYMBOLS} (hat|dot|bar|vec|tilde|und) made sense the plugin was create but now half of the symbols don't have those operations defined so they shouldn't be included.
Added pmod and combined the environments into one snippet.
`cases`, `matrix` and `align` were still using the same replacement for both inline math and block math.
So those cases are now split.

Author: superle3

src/default_snippets.js

@@ -83,6 +83,12 @@
 	{trigger: "tilde", replacement: "\\tilde{$0}$1", options: "mA"},
 	{trigger: "und", replacement: "\\underline{$0}$1", options: "mA"},
 	{trigger: "vec", replacement: "\\vec{$0}$1", options: "mA"},
+    {
+        trigger: "pmod",
+        replacement: "\\pmod{${0:n}}$1",
+        options: "mA",
+        description: "Parenthesized modulo (\\pmod{n})",
+    },
 
     // More auto letter subscript
     {trigger: /([A-Za-z])_(\d\d)/, replacement: "[[0]]_{[[1]]}", options: "rmA"},
@@ -164,12 +170,12 @@
 	{trigger: "\\\\(${GREEK}|${SYMBOL}) sr", replacement: "\\[[0]]^{2}", options: "rmA"},
 	{trigger: "\\\\(${GREEK}|${SYMBOL}) cb", replacement: "\\[[0]]^{3}", options: "rmA"},
 	{trigger: "\\\\(${GREEK}|${SYMBOL}) rd", replacement: "\\[[0]]^{$0}$1", options: "rmA"},
-	{trigger: "\\\\(${GREEK}|${SYMBOL}) hat", replacement: "\\hat{\\[[0]]}", options: "rmA"},
-	{trigger: "\\\\(${GREEK}|${SYMBOL}) dot", replacement: "\\dot{\\[[0]]}", options: "rmA"},
-	{trigger: "\\\\(${GREEK}|${SYMBOL}) bar", replacement: "\\bar{\\[[0]]}", options: "rmA"},
-	{trigger: "\\\\(${GREEK}|${SYMBOL}) vec", replacement: "\\vec{\\[[0]]}", options: "rmA"},
-	{trigger: "\\\\(${GREEK}|${SYMBOL}) tilde", replacement: "\\tilde{\\[[0]]}", options: "rmA"},
-	{trigger: "\\\\(${GREEK}|${SYMBOL}) und", replacement: "\\underline{\\[[0]]}", options: "rmA"},
+	{trigger: "\\\\(${GREEK}) hat", replacement: "\\hat{\\[[0]]}", options: "rmA"},
+	{trigger: "\\\\(${GREEK}) dot", replacement: "\\dot{\\[[0]]}", options: "rmA"},
+	{trigger: "\\\\(${GREEK}) bar", replacement: "\\bar{\\[[0]]}", options: "rmA"},
+	{trigger: "\\\\(${GREEK}) vec", replacement: "\\vec{\\[[0]]}", options: "rmA"},
+	{trigger: "\\\\(${GREEK}) tilde", replacement: "\\tilde{\\[[0]]}", options: "rmA"},
+	{trigger: "\\\\(${GREEK}) und", replacement: "\\underline{\\[[0]]}", options: "rmA"},
 
 
     // Derivatives and integrals
@@ -198,6 +204,12 @@
      replacement: "\\[[0]] [[1]]", options: "rmA",
      description: "Add space after hyperbolic trig funcs"},
 
+    {
+        trigger: /(arcsin|arccos|arctan|arccsc|arcsec|arccot)/,
+        replacement: "\\operatorname{ $0 }$1",
+        options: "mA",
+        description: "Inverse trig functions, Are not built-in MathJax functions",
+    },
 
     // Visual operations
 	{trigger: "U", replacement: "\\underbrace{ ${VISUAL} }_{ $0 }", options: "mA"},
@@ -230,31 +242,26 @@
 
 
     // Environments
-	{trigger: "pmat", replacement: "\\begin{pmatrix}\n$0\n\\end{pmatrix}", options: "MA"},
-	{trigger: "bmat", replacement: "\\begin{bmatrix}\n$0\n\\end{bmatrix}", options: "MA"},
-	{trigger: "Bmat", replacement: "\\begin{Bmatrix}\n$0\n\\end{Bmatrix}", options: "MA"},
-	{trigger: "vmat", replacement: "\\begin{vmatrix}\n$0\n\\end{vmatrix}", options: "MA"},
-	{trigger: "Vmat", replacement: "\\begin{Vmatrix}\n$0\n\\end{Vmatrix}", options: "MA"},
-	{trigger: "matrix", replacement: "\\begin{matrix}\n$0\n\\end{matrix}", options: "MA"},
-
-	{trigger: "pmat", replacement: "\\begin{pmatrix}$0\\end{pmatrix}", options: "nA"},
-	{trigger: "bmat", replacement: "\\begin{bmatrix}$0\\end{bmatrix}", options: "nA"},
-	{trigger: "Bmat", replacement: "\\begin{Bmatrix}$0\\end{Bmatrix}", options: "nA"},
-	{trigger: "vmat", replacement: "\\begin{vmatrix}$0\\end{vmatrix}", options: "nA"},
-	{trigger: "Vmat", replacement: "\\begin{Vmatrix}$0\\end{Vmatrix}", options: "nA"},
-	{trigger: "matrix", replacement: "\\begin{matrix}$0\\end{matrix}", options: "nA"},
-
-	{trigger: "cases", replacement: "\\begin{cases}\n$0\n\\end{cases}", options: "mA"},
-	{trigger: "align", replacement: "\\begin{align}\n$0\n\\end{align}", options: "mA"},
-	{trigger: "array", replacement: "\\begin{array}\n$0\n\\end{array}", options: "mA"},
-
+    // Here the regex syntax [pbBvV]mat is used to match pmat, bmat, Bmat, vmat, Vmat
+    {
+        trigger: /([pbBvV]mat|matrix|cases|align|array)/,
+        replacement: "\\begin{[[0]]}\n$0\n\\end{[[0]]}",
+        options: "rMA",
+        description: "Matrix and other environments with new lines",
+    },
+    {
+        trigger: /([pbBvV]mat|matrix|cases|align|array)/,
+        replacement: "\\begin{[[0]]}$0end{[[0]]}",
+        options: "rnA",
+    },
 
     // Brackets
 	{trigger: "avg", replacement: "\\langle $0 \\rangle $1", options: "mA"},
 	{trigger: "norm", replacement: "\\lvert $0 \\rvert $1", options: "mA", priority: 1},
 	{trigger: "Norm", replacement: "\\lVert $0 \\rVert $1", options: "mA", priority: 1},
 	{trigger: "ceil", replacement: "\\lceil $0 \\rceil $1", options: "mA"},
 	{trigger: "floor", replacement: "\\lfloor $0 \\rfloor $1", options: "mA"},
+    // For the modulo operator, see the section "More operations" above
 	{trigger: "mod", replacement: "|$0|$1", options: "mA"},
 	{trigger: "(", replacement: "(${VISUAL})", options: "mA"},
 	{trigger: "[", replacement: "[${VISUAL}]", options: "mA"},