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From "Henri Yandell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LANG-512) Compare performance of replace method to regex in Java
Date Mon, 13 Jul 2009 06:27:15 GMT

    [ https://issues.apache.org/jira/browse/LANG-512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730226#action_12730226
] 

Henri Yandell commented on LANG-512:
------------------------------------

Completely missed that there's a literal based replace from JDK 1.5 onwards. Here are the
stats when including java.lang.String.replace(CharSequence, CharSequence). Namely it sucks,
at least on OS X.

Length: 19 replacing length 7 with length 6, 5000 times. 
LANG PERF: 0:00:00.018
REGX PERF: 0:00:00.066
JDK  PERF: 0:00:00.027


Length: 190 replacing length 7 with length 6, 5000 times. 
LANG PERF: 0:00:00.028
REGX PERF: 0:00:00.099
JDK  PERF: 0:00:00.097


Length: 1900 replacing length 7 with length 6, 5000 times. 
LANG PERF: 0:00:00.244
REGX PERF: 0:00:00.778
JDK  PERF: 0:00:00.796


Length: 19000 replacing length 7 with length 6, 5000 times. 
LANG PERF: 0:00:02.452
REGX PERF: 0:00:07.733
JDK  PERF: 0:00:07.687


Length: 17000 replacing length 17 with length 16, 5000 times. 
LANG PERF: 0:00:02.121
REGX PERF: 0:00:11.659
JDK  PERF: 0:00:11.741

> Compare performance of replace method to regex in Java
> ------------------------------------------------------
>
>                 Key: LANG-512
>                 URL: https://issues.apache.org/jira/browse/LANG-512
>             Project: Commons Lang
>          Issue Type: Sub-task
>            Reporter: Henri Yandell
>             Fix For: 3.0
>
>
> Can we delete our replace methods?

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