PCRE to POSIX assistance

问题:

I need to extract the profile for these syslog entries.

May 11 09:35:59 server-0548 ea_appserver: env=ACPT profile=product_api java[31185]: 2017-05-11 09:35:59,210 server-0548 org.hibernate.internal.SessionFactoryImpl ServerService Thread Pool -- 51 HHH000008: JTASessionContext being used with JDBCTransactionFactory; auto-flush will not operate correctly with getCurrentSession()

The following regex works for PCRE but I can't seem to convert it over to POSIX.

(?m)profile=(\S+)

I've tried

[^=]*$

and

.*profile=(.*)

but can't get either to stop at just product_api

回答1:

POSIX ERE does not support inline regex modifiers, and shorthand character classes are not always supported. Note that even in your (?m)profile=(\S+) PCRE regex, the (?m) MULTILINE modifier is redudant as there is no ^, nor $ to redfine the behavior of. What you may use is a POSIX character class [:space:] (matching any whitespace) inside a negated bracket expression:

profile=([^[:space:]]+)

Details:

• profile= - a literal substring
• ([^[:space:]]+) - Group 1: one or more characters other than those that can be matched with [:space:] POSIX character class.