regex101: PCRE2 (PHP) Match Workspace

Regular Expression

^\[(?<transactionId>[^\]]+)

New

[123-456-789-098] | 2023-07-26 12:05:31:245 [application-1] INFO com.example.event.SampleClasss - status code :: 500

[321-564-986-197] | 2023-07-26 13:04:38:287 [application-1] INFO com.example.event.SampleClasss - status code :: 503

[655-256-278-865] | 2023-07-26 13:05:42:245 [application-1] INFO com.example.event.SampleClasss - status code :: 503

[457-234-856-528] | 2023-07-26 14:08:23:123[application-1] INFO com.example.event.SampleClasss - status code :: 504

Regular Expressions 101

Regular Expression

Substitution