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Top Forums UNIX for Beginners Questions & Answers How to check string contain multiple tabs or spaces? Post 303032583 by RudiC on Wednesday 20th of March 2019 02:31:48 PM
Old 03-20-2019
You seem to have a sufficiently recent shell... man bash:
Quote:
An additional binary operator, =~, is available, ... When it is used, the string to the right of the operator is considered an extended regular expression
Thus, try also

Code:
if [[ $str =~ "^hello[[:blank:]]*world" ]];

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AUSEARCH_ADD_REGEX(3)						  Linux Audit API					     AUSEARCH_ADD_REGEX(3)

NAME
ausearch_add_regex - use regular expression search rule SYNOPSIS
#include <auparse.h> int ausearch_add_regex(auparse_state_t *au, const char *expr); DESCRIPTION
ausearch_add_regex adds one search condition based on a regular expression to the current audit search expression. The search conditions can then be used to scan logs, files, or buffers for something of interest. The regular expression follows the posix extended regular expression conventions, and is matched against the full record (without interpreting field values). If an existing search expression E is already defined, this function replaces it by (E && this_regexp). RETURN VALUE
Returns -1 if an error occurs; otherwise, 0 for success. SEE ALSO
ausearch_add_expression(3), ausearch_add_item(3), ausearch_clear(3), ausearch_next_event(3), regcomp(3). AUTHOR
Steve Grubb Red Hat Sept 2007 AUSEARCH_ADD_REGEX(3)
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