在线求：如何用正则表达式表式代替后面字符串 "tr c-rise"或是"tr c-fall" 甚至是 "tr"

替换这三种字符还是替换这三种字符后面的字符？

无论是替换这三种字符还是替换其后的字符都不必用正则表达式计算：
替换这三种字符：
str=replace(replace(replace(str,"tr c-rise","要替换的字符"),"tr c-fall","要替换的字符"),"tr","要替换的字符")


替换这三种字符后的字符：
if instr(str,"tr c-rise")>0 then str=left(str,instr(str,"tr c-rise")-1) & "要替换的字符"
if instr(str,"tr c-fall")>0 then str=left(str,instr(str,"tr c-fall")-1) & "要替换的字符"
if instr(str,"tr")>0 then str=left(str,instr(str,"tr")-1) & "要替换的字符"