Fix missing commands

zepinglee · zepinglee · commit 653348330f15 · 2026-03-30T18:53:52.000+08:00
diff --git a/ustcthesis.cls b/ustcthesis.cls
@@ -1607,9 +1607,16 @@
     keywords* .clist_set:N = \l__ustc_keywords_en_clist ,
   }
 
+% \tl_set:Ne was not available until 2023-06-05.
+\cs_if_exist:NF \tl_set:Ne
+  { \cs_generate_variant:Nn \tl_set:Nn  { Ne } }
+
+% `\regex_if_match:` was not available until 2025-05-19.
+\cs_if_exist:NF \regex_if_match:nVTF
+  { \cs_new_protected:Npn \regex_if_match:nVTF { \regex_match:nVTF } }
+
 \cs_new:Npn \__ustc_set_date:n #1
   {
-    % \tl_set:Ne was not available until 2023-06-05
     \tl_set:Nx \l_tmpa_tl {#1}
     \regex_if_match:nVTF { ^ \d + - \d + - \d + $ } \l_tmpa_tl
       {

Original file line number	Diff line number	Diff line change
`@@ -1607,9 +1607,16 @@`
`1607`	`1607`	`keywords* .clist_set:N = \l__ustc_keywords_en_clist ,`
`1608`	`1608`	`}`
`1609`	`1609`
	`1610`	`+% \tl_set:Ne was not available until 2023-06-05.`
	`1611`	`+\cs_if_exist:NF \tl_set:Ne`
	`1612`	`+ { \cs_generate_variant:Nn \tl_set:Nn { Ne } }`
	`1613`	`+`
	`1614`	+% `\regex_if_match:` was not available until 2025-05-19.
	`1615`	`+\cs_if_exist:NF \regex_if_match:nVTF`
	`1616`	`+ { \cs_new_protected:Npn \regex_if_match:nVTF { \regex_match:nVTF } }`
	`1617`	`+`
`1610`	`1618`	`\cs_new:Npn \__ustc_set_date:n #1`
`1611`	`1619`	`{`
`1612`		`- % \tl_set:Ne was not available until 2023-06-05`
`1613`	`1620`	`\tl_set:Nx \l_tmpa_tl {#1}`
`1614`	`1621`	`\regex_if_match:nVTF { ^ \d + - \d + - \d + $ } \l_tmpa_tl`
`1615`	`1622`	`{`