aloha20200628

回复 1# fzp070

另一个版本...

@echo off & setlocal

   set "line=CURRENT_BLACKGAP=Z...3; hit-dyn-v2=Z...3; FEED_LIVE_VERSION=Z...3; LIVE_BUVID=Z...3; PVID=Z...3; rpdid=Z...3; buvid_fp_plain=Z...3; buvid_fp=Z...3; buvid4=Z...3; _uuid=Z...3; fingerprint=Z...3; bmg_af_switch=Z...3; CURRENT_QUALITY=Z...3; bmg_src_def_domain=Z...3; browser_resolution=Z...3; enable_web_push=Z...3; header_theme_version=Z...3; home_feed_column=Z...3; b_nut=Z...3; buvid3=Z...3; bsource_origin=Z...3; bmg_af_switch=Z...3; bmg_src_def_domain=Z...3; share_source_origin=Z...3; bili_ticket=Z...3; bili_ticket_expires=Z...3; DedeUserID=Z...3; DedeUserID__ckMd5=Z...3; SESSDATA=167.......0C; bili_jct=Z...3; sid=Z...3; bp_t_offset_330614218=Z...3; CURRENT_FNVAL=Z...3; b_lsid=Z...3; bsource=Z...3"

   setlocal enabledelayedexpansion &set "go=1" &set "ok="
   for %%a in (!line!) do if defined go if /i "%%a"=="SESSDATA" (set/a "ok=1") else if defined ok (set "go=" &set "v=%%a")
   echo,SESSDATA=!v!&pause&exit/b
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aloha20200628

回复 3# fzp070

用 grep.exe 更直截了当... （本坛第三方下载 grep.exe 落地即用 http://bcn.bathome.net/s/tool/index.html?key=grep）

@echo off & setlocal
   set "line=CURRENT_BLACKGAP=Z...3; hit-dyn-v2=Z...3; FEED_LIVE_VERSION=Z...3; LIVE_BUVID=Z...3; PVID=Z...3; rpdid=Z...3; buvid_fp_plain=Z...3; buvid_fp=Z...3; buvid4=Z...3; _uuid=Z...3; fingerprint=Z...3; bmg_af_switch=Z...3; CURRENT_QUALITY=Z...3; bmg_src_def_domain=Z...3; browser_resolution=Z...3; enable_web_push=Z...3; header_theme_version=Z...3; home_feed_column=Z...3; b_nut=Z...3; buvid3=Z...3; bsource_origin=Z...3; bmg_af_switch=Z...3; bmg_src_def_domain=Z...3; share_source_origin=Z...3; bili_ticket=Z...3; bili_ticket_expires=Z...3; DedeUserID=Z...3; DedeUserID__ckMd5=Z...3; SESSDATA=167.......0C; bili_jct=Z...3; sid=Z...3; bp_t_offset_330614218=Z...3; CURRENT_FNVAL=Z...3; b_lsid=Z...3; bsource=Z...3"

   echo,"%line%"|grep -o "SESSDATA=[^;]*"

pause&exit/b
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aloha20200628

回复 11# fzp070

   如果一楼示例字符串中包含 |& 等cmd转义字符，须用双引号包裹字符串变量 line 赋值表达式，须用双引号包裹 echo 输出数据，须将 for %%a in (%line%) ... 句式改为变量延迟句式以便逃逸 cmd 对 %line% 的预处理... 据此已订正8楼代码。
   如果源数据被存入文本文件（假定为 1.txt）且只有一行，可用以下版本

@echo off &setlocal &set "go=1" &set "ok="
for /f "delims=" %%a in (1.txt) do for %%x in (%%a) do if defined go if /i "%%x"=="SESSDATA" (set/a "ok=1") else if defined ok (set "go=" &set "v=%%x")
set/p="SESSDATA=%v%"<nul&echo,&pause&exit/b
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若用 grep 一行流则可提取出 1.txt 中每行（若不止一行数据）的目标字段 "SESSDATA=..."，并可定向输出到 2.txt

type "1.txt"|grep -o "SESSDATA=[^;]*">"2.txt"
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aloha20200628

回复 15# fzp070

   8楼代码已订正，因已采用变量延迟故将%v%改为!v!即可取消双引号，也不怕其中包含 &| 等特殊字符 '作祟'。
   14楼代码因全程未用延迟变量，故须改用 set/p="SESSDATA=%v%"<nul&echo, 句式，以避免其中可能包含的特殊字符 '作祟' ...