📄 ch26_09.htm
字号:
ROWSPAN="1"COLSPAN="1">\<\></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><PCLASS="para">Match word's beginning or end.</P></TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">+</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><PCLASS="para">Match one or more preceding.</P></TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">?</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><PCLASS="para">Match zero or one preceding.</P></TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">|</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><PCLASS="para">Separate choices to match.</P></TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">()</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><PCLASS="para">Group expressions to match.</P></TD></TR></TBODY></TABLE><PCLASS="para">In <EMCLASS="emphasis">ed</EM>, <EMCLASS="emphasis">ex</EM>, and <EMCLASS="emphasis">sed</EM>, note that you specify both a search pattern (on the left)and a replacement pattern (on the right). The metacharactersin<ACLASS="xref"HREF="ch26_09.htm#UPT-ART-7951-TAB-0"TITLE="Valid Metacharacters for Different Programs">Table 26.4</A>are meaningful only in a search pattern.<EMCLASS="emphasis">ed</EM>, <EMCLASS="emphasis">ex</EM>, and <EMCLASS="emphasis">sed</EM> support theadditional metacharacters in<ACLASS="xref"HREF="ch26_09.htm#UPT-ART-7951-TAB-1"TITLE="Valid Metacharacters for Replacement Patterns">Table 26.5</A>that are valid only in a replacement pattern.</P><TABLECLASS="table"><CAPTIONCLASS="table"><ACLASS="title"NAME="UPT-ART-7951-TAB-1">Table 26.5: Valid Metacharacters for Replacement Patterns</A></CAPTION><THEADCLASS="thead"><TRCLASS="row"VALIGN="TOP"><THCLASS="entry"ALIGN="LEFT"ROWSPAN="1"COLSPAN="1">Symbol</TH><THCLASS="entry"ALIGN="LEFT"ROWSPAN="1"COLSPAN="1">ex</TH><THCLASS="entry"ALIGN="LEFT"ROWSPAN="1"COLSPAN="1">sed</TH><THCLASS="entry"ALIGN="LEFT"ROWSPAN="1"COLSPAN="1">ed</TH><THCLASS="entry"ALIGN="LEFT"ROWSPAN="1"COLSPAN="1">Action</TH></TR></THEAD><TBODYCLASS="tbody"><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">\</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">Escape character following.</TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">\<CODECLASS="replaceable"><I>n</I></CODE></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">Reuse pattern stored in <CODECLASS="literal">\( \)</CODE>.</TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">&</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">Reuse previous search pattern.</TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">~</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">Reuse previous replacement pattern.</TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">\u \U</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">Change character(s) to uppercase.</TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">\l \L</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">Change character(s) to lowercase.</TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">\E</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">Turn off previous <CODECLASS="literal">\U</CODE> or <CODECLASS="literal">\L</CODE>.</TD></TR><TRCLASS="row"VALIGN="TOP"><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">\e</TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"><IMGSRC="../chars/bull.gif"ALT="·"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1"></TD><TDCLASS="entry"ROWSPAN="1"COLSPAN="1">Turn off previous <CODECLASS="literal">\u</CODE> or <CODECLASS="literal">\l</CODE>.</TD></TR></TBODY></TABLE><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">DG</SPAN></P></DIV></DIV><DIVCLASS="htmlnav"><P></P><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch26_08.htm"TITLE="26.8 I Never Meta Character I Didn't Like "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 26.8 I Never Meta Character I Didn't Like "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="book"HREF="index.htm"TITLE="UNIX Power Tools"><IMGSRC="gifs/txthome.gif"SRC="gifs/txthome.gif"ALT="UNIX Power Tools"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch26_10.htm"TITLE="26.10 Pattern Matching Quick Reference with Examples "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 26.10 Pattern Matching Quick Reference with Examples "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">26.8 I Never Meta Character I Didn't Like </TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="index"HREF="index/idx_0.htm"TITLE="Book Index"><IMGSRC="gifs/index.gif"SRC="gifs/index.gif"ALT="Book Index"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172">26.10 Pattern Matching Quick Reference with Examples </TD></TR></TABLE><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><IMGSRC="gifs/smnavbar.gif"SRC="gifs/smnavbar.gif"USEMAP="#map"BORDER="0"ALT="The UNIX CD Bookshelf Navigation"><MAPNAME="map"><AREASHAPE="RECT"COORDS="0,0,73,21"HREF="../index.htm"ALT="The UNIX CD Bookshelf"><AREASHAPE="RECT"COORDS="74,0,163,21"HREF="index.htm"ALT="UNIX Power Tools"><AREASHAPE="RECT"COORDS="164,0,257,21"HREF="../unixnut/index.htm"ALT="UNIX in a Nutshell"><AREASHAPE="RECT"COORDS="258,0,321,21"HREF="../vi/index.htm"ALT="Learning the vi Editor"><AREASHAPE="RECT"COORDS="322,0,378,21"HREF="../sedawk/index.htm"ALT="sed & awk"><AREASHAPE="RECT"COORDS="379,0,438,21"HREF="../ksh/index.htm"ALT="Learning the Korn Shell"><AREASHAPE="RECT"COORDS="439,0,514,21"HREF="../lrnunix/index.htm"ALT="Learning the UNIX Operating System"></MAP></DIV></BODY></HTML>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -