How to extract text from string using regular expressions

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

regular expression with shell script to extract data out of a text file

hi i am trying to extract some specific data out of a text file using regular expressions with shell script that is using a multiline grep .. and the tool i am using is pcregrep so that i can get compatibility with perl's regular expressions for a sample data like this, i am trying to grab...

2. UNIX for Dummies Questions & Answers

extract columns using grep or regular expressions

I am trying to print columns from a table whose name (header) matches a certain string. E.g., patient1001 patient1002 patient2005 patient3005 patient4001 0 0 0 0 0 2 9 2 8 3 2 7 3 0 2 Say I want to print columns whose names end with "01" patient1001 patient4001 0 0 2 3 2 2 ...

3. Shell Programming and Scripting

Regular Expressions

I am new to shell scripts.Can u please help me on this req. test_user = "Arun" if echo "test_user is a word" else echo "test_user is not a word"

4. Shell Programming and Scripting

Help with regular expressions

I have a file that I'm trying to find all the cases of phone number extensions and deleting them. So input file looks like: abc x93825 def 13234 x52673 hello output looks like: abc def 13234 hello Basically delete lines that have 5 numbers following "x". I tried: x\(4) but it...

5. Shell Programming and Scripting

Regular expressions help

need a regex that matches when a number has a zero (0) at the end of it so like 10 20 120 30 330 1000 and so on

6. Shell Programming and Scripting

Regular Expressions

what elements does " /^/ " match? I did the test which indicates that it matches single lowercase character like 'a','b' etc. and '1','2' etc. But I really confused with that. Because, "/^abc/" matches strings like "abcedf" or "abcddddee". So, what does caret ^ really mean? Any response...

7. UNIX for Dummies Questions & Answers

Regular expressions

In regular expressions with grep(or egrep), ^ works if we want something in starting of line..but what if we write ^^^ or ^ for pattern matching??..Hope u all r familiar with regular expressions for pattern matching..

8. Shell Programming and Scripting

Need help in string extraction using regular expressions

Hi, I am a new bee to this forum. I am trying to extract the text after a matching pattern from a url using regular expression. Ex: http://locatlhost:2020/proxy/checkthisout I want to extract the string after proxy/. I am not familiar with reg ex. Can someone please help?

9. Shell Programming and Scripting

regular expressions

Hello, Let say I have a string with content "Free 100%". How can extract only "100" using ksh? I would this machanism to work if instead of "100" there is any kind of combination of numbers(ex. "32", "1238", "1"). I want to get only the digits. I have written something like this: ...

10. Shell Programming and Scripting

Regular Expressions

I'm trying to parse RichText to XML. I want to be able to capture everything between the '/par' tag in the RTF but not include the tag itself. So far all I have is this, '.*?\\par' but it leaves '\par' at the end of it. Any suggestions?

LEARN ABOUT OPENSOLARIS

re_comp

re_comp(3C)						   Standard C Library Functions 					       re_comp(3C)

NAME

       re_comp, re_exec - compile and execute regular expressions

SYNOPSIS

       #include <re_comp.h>

       char *re_comp(const char *string);

       int re_exec(const char *string);

DESCRIPTION

       The  re_comp() function converts a regular expression string (RE) into an internal form suitable for pattern matching.  The re_exec() func-
       tion compares the string pointed to by the string argument with the last regular expression passed to re_comp().

       If re_comp() is called with a null pointer argument, the current regular expression remains unchanged.

       Strings passed to both re_comp() and re_exec() must be terminated by a null byte, and may include NEWLINE characters.

       The re_comp() and re_exec() functions support simple regular expressions, which are defined on the  regexp(5)  manual  page.  The   regular
       expressions of the form {m}, {m,}, or {m,n} are not supported.

RETURN VALUES

       The  re_comp()  function  returns a null pointer when the string pointed to by the string argument is successfully converted.  Otherwise, a
       pointer to one of the following error message strings is returned:

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

       Upon successful completion, re_exec() returns 1 if string matches the last compiled regular expression.	Otherwise, re_exec() returns 0	if
       string  fails  to  match the last compiled regular expression, and -1 if the compiled regular expression is invalid (indicating an internal
       error).

ERRORS

       No errors are defined.

USAGE

       For portability to implementations conforming to X/Open standards prior to SUS, regcomp(3C) and regexec(3C) are preferred  to  these  func-
       tions.  See standards(5).

SEE ALSO

       grep(1), regcmp(1), regcmp(3C), regcomp(3C), regexec(3C), regexpr(3GEN), regexp(5), standards(5)

SunOS 5.11							    26 Feb 1997 						       re_comp(3C)

Shell Programming and Scripting