unix regular expression examples

Pattern modifier Pattern modifier--explain the modifiers used in regular expression patterns Description The following is a list of possible modifiers that are currently available in PCRE. The internal PCRE names of these modifiers are in parentheses. The blanks and line breaks in the modifier are ignored, and other characters can cause errors. I (pcre_caseless) If you set this modifier, the characters in

look at how to use the above metacharacters in regular expressions through examples. /\ S +/the above regular expression can be used to match one or more space characters in the target object. /\ D000/if we have a complex financial statement in hand, we can easily find all the total amount of RMB through the above

Regular Expression Pattern modifier, regular expression Modifier I (PCRE_CASELESS) If this modifier is set, the letters in the mode are case-insensitive. M (PCRE_MULTILINE) By default, PCRE considers the target string to be composed of single-line characters (however, it may actually contain multiple lines), and the "f

a character, so we use \. To match it, there is such a regular/"(?: \ \.| [^"]) * "/g May be not familiar with the friend, suddenly from/"[^"]* "/g to/" (?: \ \.| [^"]) * "After/g understand, I simply explained." (?:) is a non-capturing group and does not store content in memory. \\. Used to match an escape character such as \ \a, which cons

Introduction: Through this study, you can add some useful skills for designing actual regular Expressions (regexp). Building regular expressions is part of any administrator's daily work. In order to construct a successful regular expression that returns the required conditions, you need to learn to think in a pattern-

backslash is followed by a letter that has no special meaning. No other features are currently controlled by this modifier. U (PCRE_UTF8) This modifier enables an additional feature that is incompatible with Perl in a PCRE. The pattern string is treated as UTF-8. This modifier is available under Unix from PHP 4.1.0 and is available under Win32 from PHP 4.2.3. about reverse References The reverse reference and the child mode are related. /()/is

_ confirm repeated occurrence1. IntroductionAt present, regular expressions have been widely used in many software applications, including * nix (Linux, Unix, etc.), HP and other operating systems, PHP, C #, Java and other development environments, and many applications can see the shadow of regular expressions. The use of r