# Parsing inside log file

**URL:** <https://community.dynatrace.com/t/parsing-inside-log-file/41312>\
**Category:** DQL\
**Tags:** dql, dynatrace-managed, logs\
**Created:** [August 23, 2023, 12:27am UTC](https://community.dynatrace.com/t/parsing-inside-log-file/41312 "2023-08-23T00:27:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Mahdi24322](https://avatars.discourse-cdn.com/v4/letter/m/f1d935/32.png) [@Mahdi24322](https://community.dynatrace.com/u/Mahdi24322)\
**Post date:** [August 23, 2023, 12:27am UTC](https://community.dynatrace.com/t/parsing-inside-log-file/41312/1 "2023-08-23T00:27:49Z")

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Hi community,

I am actually stuck in a parameter, I have a log file that contain a line :

number of rows&nbsp;= 0

and I need to monitor this value (0) if it changes to a different value more than (0) , it means that something is going wrong, I think that using DQL to create a log metrics should help, but I am stuck in this , can someone help please.

Regards

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**Author:** ![heybeckerj](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/heybeckerj/32/22189_2.png) [@heybeckerj](https://community.dynatrace.com/u/heybeckerj)\
**Post date:** [August 23, 2023, 3:13am UTC](https://community.dynatrace.com/t/parsing-inside-log-file/41312/2 "2023-08-23T03:13:52Z")

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Hi&nbsp;[@Mahdi24322](https://community.dynatrace.com/user/66097)&nbsp;,

You can use DPL to parse lines and test phrases.

There are some examples here:&nbsp;[DPL Lines and Strings — Dynatrace Docs](https://www.dynatrace.com/support/help/platform/grail/dynatrace-pattern-language/log-processing-lines-strings)

> **[DPL Pattern Expression Macros](https://docs.dynatrace.com/docs/platform/grail/dynatrace-pattern-language/log-processing-macros)**
>
> Explore DPL syntax for creating a series of matcher expressions (subpatterns).

> **[DPL Architect](https://docs.dynatrace.com/docs/platform/grail/dynatrace-pattern-language/dpl-architect)**
>
> Extract fields with Dynatrace Pattern Language Architect.

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<div class="post-metadata">

**Author:** ![Mahdi24322](https://avatars.discourse-cdn.com/v4/letter/m/f1d935/32.png) [@Mahdi24322](https://community.dynatrace.com/u/Mahdi24322)\
**Post date:** [September 4, 2023, 2:08pm UTC](https://community.dynatrace.com/t/parsing-inside-log-file/41312/3 "2023-09-04T14:08:15Z")

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thanks a lot&nbsp;[@heybeckerj](https://community.dynatrace.com/user/46908)