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Top Forums UNIX for Dummies Questions & Answers grep regular expression to find = not == Post 302413367 by offkilter on Thursday 15th of April 2010 11:26:35 AM
Old 04-15-2010
grep regular expression to find = not ==

I suspect this is commonly done, but haven't found the right combination of search terms to find the answer.

I want to grep for lines in .cpp files that contain only 1 '=' sign in an if statement. e.g.,
if (a = b) -- find this
if (a==b) -- don't find this

My attempt:
Code:
egrep "^if\b*\(.+=[^=]*" *.cpp

This finds lines with 1 =, but it is also finding lines with ==.

Also, if i use grep instead of egrep I get "RE error 42: \( \) imbalance".
 

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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep. If no file is speci- fied, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If zgrep is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. For example: for sh: GREP=fgrep zgrep string files for csh: (setenv GREP fgrep; zgrep string files) AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), egrep(1), fgrep(1), zdiff(1), zmore(1), znew(1), zforce(1), gzip(1), gzexe(1) ZGREP(1)
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