> Source: [sk183367](https://support.checkpoint.com/results/sk/sk183367)

# sk183367 - Identity Collector Identity Filter fails to match identities with names that start with "\p" or "\g"

| Property | Value |
|----------|-------|
| Solution ID | sk183367 |
| Date Created | 2025-05-18 |
| Last Modified | 2025-06-30 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |

## Symptoms

- * The "Identity Filter" list (Include or Exclude) contains multiple identities, but none of them match rules.
* After enabling Identity Collector debug mode, these similar compile errors appear in the ia_ag.log file. kiss_pcre_compile: pcre compile failed at offset 9 with error message: unknown property name after \\P or \\p. pattern:   
  > **\^(domain\\gfirst.last)$**
  > `kiss_pcre_compile: pcre compile failed at offset 9 with error message: unknown property name after \P or \p. pattern: `  
  > `
  > `**^(domain\pfirst.last)$**` `  
  > `
  > kiss_pm_compile_add_array_handle: kiss_tier2_compile failed `  
  > `
  > kiss_pm_destroy: No more holders of PM handle 0B1173C0, destroying it `  
  > `
  > [RegularExp (TD::Critical)] NAC::IDCOLLECTOR::RegularExp::compilePatterns: Error while trying to compile the PM: `  
  > `
  > Error: unknown property name after \P or \p Type: 0 index: 24 pattern: 13 `

## Cause

If an identity in the filter contains an unsupported/reserved string, it causes all other identities to fail to match. These are the unsupported strings: "`\p`", "`\g`", "`\P`", or "`\G`".

## Solution

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