Extracting regular expression

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

sed: -e expression #1, char 0: no previous regular expression

Hello All, I'm trying to extract the lines between two consecutive elements of an array from a file. My array looks like: problem_arr=(PRS111 PRS213 PRS234) j=0 while } ] do k=`expr $j + 1` sed -n "/${problem_arr}/,/${problem_arr}/p" problemid.txt ---some operation goes...

2. Shell Programming and Scripting

regular expression and ls

hello using KSH shell i have those files in a folder FILE01 FILE1 FILE02 FILE2 FILE001 FILE0001 in a script i would like to list all the files through regular expressions i tried this ls FILE+* but i receive this error ls: 0653-341 The file FILE+* does not exist. what is...

3. UNIX for Dummies Questions & Answers

Help with regular expression

Hi All, Need some help with a regular expression that I cant seem to work on. Say there is the following text - Input We all (need some) help some day (ps: when it rains) and I need to save some hay now. During the rainy season (ps: when it might rain heavily) Seattle gets drenched but not...

4. Programming

Perl: How to read from a file, do regular expression and then replace the found regular expression

Hi all, How am I read a file, find the match regular expression and overwrite to the same files. open DESTINATION_FILE, "<tmptravl.dat" or die "tmptravl.dat"; open NEW_DESTINATION_FILE, ">new_tmptravl.dat" or die "new_tmptravl.dat"; while (<DESTINATION_FILE>) { # print...

5. Shell Programming and Scripting

Integer expression expected: with regular expression

CA_RELEASE has a value of 6. I need to check if that this is a numeric value. if not error. source $CA_VERSION_DATA if * ] then echo "CA_RELESE $CA_RELEASE is invalid" exit -1 fi + source /etc/ncgl/ca_version_data ++ CA_PRODUCT_ID=samxts ++ CA_RELEASE=6 ++ CA_WEEK_NO=7 ++...

6. Shell Programming and Scripting

regular expression [^ ]

Hi, Could anybody explain why will evaluate to true for a string that is not null, not empty string, and has at least one non-space char? My understanding is that ^ means exclude all chars inside . So I thought it should mean anything except space. This seems a big mystery to me.

7. Linux

Regular expression to extract "y" from "abc/x.y.z" .... i need regular expression

Regular expression to extract "y" from "abc/x.y.z"

8. Shell Programming and Scripting

regular expression

Hi all, My log file is like 19:40:22 INFO :Total time taken to Service External Request---15ms 19:40:22 INFO : External service failed with status KO 19:40:22 FATAL: External service failed with status KO 19:40:22 DEBUG : Batch started with 19:40:22 ERROR: Member: dmidecode.x86_64...

9. Shell Programming and Scripting

regular expression

Hello All! I have a file thats something like this: ( a grep output) /path/of/file/filename.abc.xyz.pqr:! Commented text /path/of/file/filename.abc.xyz: ! More Commented text I need to grep out those line from this file whose filename has ".abc" in the filename (anywhere in filename)...

10. Shell Programming and Scripting

Regular Expression + Aritmetical Expression

Is it possible to combine a regular expression with a aritmetical expression? For example, taking a 8-numbers caracter sequece and casting each output of a grep, comparing to a constant. THX!

LEARN ABOUT BSD

regex

REGEX(3)						     Library Functions Manual							  REGEX(3)

NAME

       re_comp, re_exec - regular expression handler

SYNOPSIS

       char *re_comp(s)
       char *s;

       re_exec(s)
       char *s;

DESCRIPTION

       Re_comp	compiles a string into an internal form suitable for pattern matching.	Re_exec checks the argument string against the last string
       passed to re_comp.

       Re_comp returns 0 if the string s was compiled successfully; otherwise a string containing an error message  is	returned.  If  re_comp	is
       passed 0 or a null string, it returns without changing the currently compiled regular expression.

       Re_exec returns 1 if the string s matches the last compiled regular expression, 0 if the string s failed to match the last compiled regular
       expression, and -1 if the compiled regular expression was invalid (indicating an internal error).

       The strings passed to both re_comp and re_exec may have trailing or embedded newline characters; they are terminated by nulls.  The regular
       expressions recognized are described in the manual entry for ed(1), given the above difference.

SEE ALSO

       ed(1), ex(1), egrep(1), fgrep(1), grep(1)

DIAGNOSTICS

       Re_exec returns -1 for an internal error.

       Re_comp returns one of the following strings if an error occurs:

	    No previous regular expression,
	    Regular expression too long,
	    unmatched (,
	    missing ],
	    too many () pairs,
	    unmatched ).

3rd Berkeley Distribution					   May 15, 1985 							  REGEX(3)

Shell Programming and Scripting