[GROOVY-6805] String#getAt(Pattern, int) for Regex Matcher

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: groovy-jdk
• Labels: extensionMethod gdk regex regexp string
• Assignee: Unassigned
• Reporter: Kenneth Endfinger
• Created: 19/May/14 10:43
• Updated: 02/Jun/15 17:09

Description

Add String#getAt(Pattern, int) and String#getAt(String, int) extension methods.

This will be similar to

StringGroovyMethods.java

public static String getAt(String self, Pattern pattern, int index) {
    Matcher matcher = pattern.matcher(self);
    if (!matcher.find()) {
        return null;
    }
    return matcher.group(index + 1); /* I think adding 1 is required, it may not be though to mimic Ruby */
}

public static String getAt(String self, String pattern, int index) throws PatternSyntaxException {
    return getAt(self, Pattern.compile(pattern), index);
}

Usage.groovy

assert "Hello".[/(H)ello/, 0] == "H"

The goal of this is to mimic Ruby's Behavior.

NOTICE: I probably have an error in my implementation, but hopefully you get the gist of it.

ALSO
We could also add named capturing groups support (aka getAt(Pattern, String))

Gist